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Class: ActiveRecord::Base

Overview

Active Record objects don’t specify their attributes directly, but rather infer them from the table definition with which they’re linked. Adding, removing, and changing attributes and their type is done directly in the database. Any change is instantly reflected in the Active Record objects. The mapping that binds a given Active Record class to a certain database table will happen automatically in most common cases, but can be overwritten for the uncommon ones.

See the mapping rules in table_name and the full example in README for more insight.

Creation

Active Records accept constructor parameters either in a hash or as a block. The hash method is especially useful when you’re receiving the data from somewhere else, like an HTTP request. It works like this:

user = User.new(name: "David", occupation: "Code Artist")
user.name # => "David"

You can also use block initialization:

user = User.new do |u|
  u.name = "David"
  u.occupation = "Code Artist"
end

And of course you can just create a bare object and specify the attributes after the fact:

user = User.new
user.name = "David"
user.occupation = "Code Artist"

Conditions

Conditions can either be specified as a string, array, or hash representing the WHERE-part of an SQL statement. The array form is to be used when the condition input is tainted and requires sanitization. The string form can be used for statements that don’t involve tainted data. The hash form works much like the array form, except only equality and range is possible. Examples:

class User < ActiveRecord::Base
  def self.authenticate_unsafely(user_name, password)
    where("user_name = '#{user_name}' AND password = '#{password}'").first
  end

  def self.authenticate_safely(user_name, password)
    where("user_name = ? AND password = ?", user_name, password).first
  end

  def self.authenticate_safely_simply(user_name, password)
    where(user_name: user_name, password: password).first
  end
end

The authenticate_unsafely method inserts the parameters directly into the query and is thus susceptible to SQL-injection attacks if the user_name and password parameters come directly from an HTTP request. The authenticate_safely and authenticate_safely_simply both will sanitize the user_name and password before inserting them in the query, which will ensure that an attacker can’t escape the query and fake the login (or worse).

When using multiple parameters in the conditions, it can easily become hard to read exactly what the fourth or fifth question mark is supposed to represent. In those cases, you can resort to named bind variables instead. That’s done by replacing the question marks with symbols and supplying a hash with values for the matching symbol keys:

Company.where(
  "id = :id AND name = :name AND division = :division AND created_at > :accounting_date",
  { id: 3, name: "37signals", division: "First", accounting_date: '2005-01-01' }
).first

Similarly, a simple hash without a statement will generate conditions based on equality with the SQL AND operator. For instance:

Student.where(first_name: "Harvey", status: 1)
Student.where(params[:student])

A range may be used in the hash to use the SQL BETWEEN operator:

Student.where(grade: 9..12)

An array may be used in the hash to use the SQL IN operator:

Student.where(grade: [9,11,12])

When joining tables, nested hashes or keys written in the form ‘table_name.column_name’ can be used to qualify the table name of a particular condition. For instance:

Student.joins(:schools).where(schools: { category: 'public' })
Student.joins(:schools).where('schools.category' => 'public' )

Overwriting default accessors

All column values are automatically available through basic accessors on the Active Record object, but sometimes you want to specialize this behavior. This can be done by overwriting the default accessors (using the same name as the attribute) and calling super to actually change things.

class Song < ActiveRecord::Base
  # Uses an integer of seconds to hold the length of the song

  def length=(minutes)
    super(minutes.to_i * 60)
  end

  def length
    super / 60
  end
end

Attribute query methods

In addition to the basic accessors, query methods are also automatically available on the Active Record object. Query methods allow you to test whether an attribute value is present. Additionally, when dealing with numeric values, a query method will return false if the value is zero.

For example, an Active Record User with the name attribute has a name? method that you can call to determine whether the user has a name:

user = User.new(name: "David")
user.name? # => true

anonymous = User.new(name: "")
anonymous.name? # => false

Accessing attributes before they have been typecasted

Sometimes you want to be able to read the raw attribute data without having the column-determined typecast run its course first. That can be done by using the <attribute>_before_type_cast accessors that all attributes have. For example, if your Account model has a balance attribute, you can call account.balance_before_type_cast or account.id_before_type_cast.

This is especially useful in validation situations where the user might supply a string for an integer field and you want to display the original string back in an error message. Accessing the attribute normally would typecast the string to 0, which isn’t what you want.

Dynamic attribute-based finders

Dynamic attribute-based finders are a mildly deprecated way of getting (and/or creating) objects by simple queries without turning to SQL. They work by appending the name of an attribute to find_by_ like Person.find_by_user_name. Instead of writing Person.find_by(user_name: user_name), you can use Person.find_by_user_name(user_name).

It’s possible to add an exclamation point (!) on the end of the dynamic finders to get them to raise an RecordNotFound error if they do not return any records, like Person.find_by_last_name!.

It’s also possible to use multiple attributes in the same find_by_ by separating them with “and”.

Person.find_by(user_name: user_name, password: password)
Person.find_by_user_name_and_password(user_name, password) # with dynamic finder

It’s even possible to call these dynamic finder methods on relations and named scopes.

Payment.order("created_on").find_by_amount(50)

Saving arrays, hashes, and other non-mappable objects in text columns

Active Record can serialize any object in text columns using YAML. To do so, you must specify this with a call to the class method serialize. This makes it possible to store arrays, hashes, and other non-mappable objects without doing any additional work.

class User < ActiveRecord::Base
  serialize :preferences
end

user = User.create(preferences: { "background" => "black", "display" => large })
User.find(user.id).preferences # => { "background" => "black", "display" => large }

You can also specify a class option as the second parameter that’ll raise an exception if a serialized object is retrieved as a descendant of a class not in the hierarchy.

class User < ActiveRecord::Base
  serialize :preferences, Hash
end

user = User.create(preferences: %w( one two three ))
User.find(user.id).preferences    # raises SerializationTypeMismatch

When you specify a class option, the default value for that attribute will be a new instance of that class.

class User < ActiveRecord::Base
  serialize :preferences, OpenStruct
end

user = User.new
user.preferences.theme_color = "red"

Single table inheritance

Active Record allows inheritance by storing the name of the class in a column that is named “type” by default. See Inheritance for more details.

Connection to multiple databases in different models

Connections are usually created through .establish_connection and retrieved by ActiveRecord::Base.connection. All classes inheriting from Base will use this connection. But you can also set a class-specific connection. For example, if Course is an Base, but resides in a different database, you can just say Course.establish_connection and Course and all of its subclasses will use this connection instead.

This feature is implemented by keeping a connection pool in Base that is a hash indexed by the class. If a connection is requested, the .retrieve_connection method will go up the class-hierarchy until a connection is found in the connection pool.

Exceptions

  • ActiveRecordError - Generic error class and superclass of all other errors raised by Active Record.

  • AdapterNotSpecified - The configuration hash used in .establish_connection didn’t include an :adapter key.

  • AdapterNotFound - The :adapter key used in .establish_connection specified a non-existent adapter (or a bad spelling of an existing one).

  • AssociationTypeMismatch - The object assigned to the association wasn’t of the type specified in the association definition.

  • AttributeAssignmentError - An error occurred while doing a mass assignment through the #attributes= method. You can inspect the attribute property of the exception object to determine which attribute triggered the error.

  • ConnectionNotEstablished - No connection has been established. Use .establish_connection before querying.

  • MultiparameterAssignmentErrors - Collection of errors that occurred during a mass assignment using the #attributes= method. The errors property of this exception contains an array of AttributeAssignmentError objects that should be inspected to determine which attributes triggered the errors.

  • RecordInvalid - raised by #save! and .create! when the record is invalid.

  • RecordNotFound - No record responded to the .find method. Either the row with the given ID doesn’t exist or the row didn’t meet the additional restrictions. Some .find calls do not raise this exception to signal nothing was found, please check its documentation for further details.

  • SerializationTypeMismatch - The serialized object wasn’t of the class specified as the second parameter.

  • StatementInvalid - The database server rejected the SQL statement. The precise error is added in the message.

Note: The attributes listed are class-level attributes (accessible from both the class and instance level). So it’s possible to assign a logger to the class through .logger= which will then be used by all instances in the current object space.

Constant Summary

::ActiveModel::AttributeMethods - Included

CALL_COMPILABLE_REGEXP, NAME_COMPILABLE_REGEXP

AttributeMethods - Included

RESTRICTED_CLASS_METHODS

Callbacks - Included

CALLBACKS

::ActiveModel::SecurePassword - Included

MAX_PASSWORD_LENGTH_ALLOWED

SecureToken - Included

MINIMUM_TOKEN_LENGTH

Callback Registration

Attributes - Attributes & Methods

AutosaveAssociation - Attributes & Methods

Core - Attributes & Methods

Inheritance - Attributes & Methods

Integration - Attributes & Methods

ModelSchema - Attributes & Methods

NestedAttributes - Attributes & Methods

ReadonlyAttributes - Attributes & Methods

Reflection - Attributes & Methods

SignedId - Attributes & Methods

Store - Attributes & Methods

Timestamp - Attributes & Methods

Locking::Optimistic - Attributes & Methods

Class Attribute Summary

ConnectionHandling - Extended

connected?

Returns true if Active Record is connected.
connection_specification_name

Return the connection specification name from the current class or its parent.
connection_specification_name=

Class Method Summary

Aggregations::ClassMethods - Extended

composed_of

Adds reader and writer methods for manipulating a value object: composed_of :address adds address and address=(new_address) methods.

Enum - Extended

_enum_methods_module, assert_valid_enum_definition_values, detect_enum_conflict!, detect_negative_enum_conditions!, enum, raise_conflict_error

DelegatedType - Extended

delegated_type

Defines this as a class that’ll delegate its type for the passed role to the class references in types.

::ActiveModel::Translation - Included

human_attribute_name

Transforms attribute names into a more human format, such as “First name” instead of “first_name”.
i18n_scope

Returns the i18n_scope for the class.
lookup_ancestors

When localizing a string, it goes through the lookup returned by this method, which is used in ActiveModel::Name#human, ActiveModel::Errors#full_messages and ActiveModel::Translation#human_attribute_name.

QueryCache::ClassMethods - Extended

cache

Enable the query cache within the block if Active Record is configured.
uncached

Disable the query cache within the block if Active Record is configured.

ConnectionHandling - Extended

clear_active_connections!, clear_all_connections!,
clear_query_caches_for_current_thread

Clears the query cache for all connections associated with the current thread.
clear_reloadable_connections!,
connected_to

Connects to a role (ex writing, reading or a custom role) and/or shard for the duration of the block.
connected_to?

Returns true if role is the current connected role.
connected_to_many

Connects a role and/or shard to the provided connection names.
connecting_to

Use a specified connection.
connection

Returns the connection currently associated with the class.
connection_config

Returns the configuration of the associated connection as a hash:
connection_db_config

Returns the db_config object from the associated connection:
connection_pool,
connects_to

Connects a model to the databases specified.
establish_connection

Establishes the connection to the database.
flush_idle_connections!, remove_connection, retrieve_connection,
while_preventing_writes

Prevent writing to the database regardless of role.

::ActiveSupport::DescendantsTracker - Extended

descendants, direct_descendants, inherited,
subclasses

Alias for ActiveSupport::DescendantsTracker#direct_descendants.

::ActiveSupport::Benchmarkable - Extended

benchmark

Allows you to measure the execution time of a block in a template and records the result to the log.

::ActiveModel::Naming - Extended

model_name

Returns an ::ActiveModel::Name object for module.

Instance Attribute Summary

Serialization - Included

#include_root_in_json, #include_root_in_json?

NoTouching - Included

#no_touching?

Returns true if the class has no_touching set, false otherwise.

AutosaveAssociation - Included

#changed_for_autosave?

Returns whether or not this record has been changed in any way (including whether any of its nested autosave associations are likewise changed).
#destroyed_by_association

Returns the association for the parent being destroyed.
#destroyed_by_association=

Records the association that is being destroyed and destroying this record in the process.
#marked_for_destruction?

Returns whether or not this record will be destroyed as part of the parent’s save transaction.

AttributeMethods::Dirty - self

#has_changes_to_save?

Will the next call to save have any changes to persist?
#saved_changes?

Did the last call to save have any changes to change?

::ActiveModel::Dirty - Included

#attribute_aliases, #attribute_aliases?, #attribute_method_matchers, #attribute_method_matchers?,
#changed?

Returns true if any of the attributes has unsaved changes, false otherwise.

AttributeMethods::PrimaryKey - self

#id

Returns the primary key column’s value.
#id=

Sets the primary key column’s value.
#id?

Queries the primary key column’s value.

AttributeMethods - Included

#attribute_aliases, #attribute_aliases?, #attribute_method_matchers, #attribute_method_matchers?

Validations - Included

#_validators, #_validators?, #validation_context

::ActiveModel::AttributeAssignment - Included

#attributes=

Alias for ActiveModel::AttributeAssignment#assign_attributes.

Persistence - Included

#destroyed?

Returns true if this object has been destroyed, otherwise returns false.
#new_record?

Returns true if this object hasn’t been saved yet – that is, a record for the object doesn’t exist in the database yet; otherwise, returns false.
#persisted?

Returns true if the record is persisted, i.e.
#previously_new_record?

Returns true if this object was just created – that is, prior to the last save, the object didn’t exist in the database and new_record? would have returned true.

Core - Included

#frozen?

Returns true if the attributes hash has been frozen.
#readonly?

Returns true if the record is read only.
#strict_loading?

Returns true if the record is in strict_loading mode.

Instance Method Summary

SignedId - Included

#signed_id

Returns a signed id that’s generated using a preconfigured ::ActiveSupport::MessageVerifier instance.

Store - Included

#read_store_attribute, #write_store_attribute

Serialization - Included

#serializable_hash

::ActiveModel::Serializers::JSON - Included

#as_json

Returns a hash representing the model.
#from_json

Sets the model attributes from a JSON string.

::ActiveModel::Serialization - Included

#serializable_hash

Returns a serialized hash of your object.

Transactions - Included

#transaction

See Transactions::ClassMethods for detailed documentation.
#with_transaction_returning_status

Executes method within a transaction and captures its return value as a status flag.

AutosaveAssociation - Included

#mark_for_destruction

Marks this record to be destroyed as part of the parent’s save transaction.
#reload

Reloads the attributes of the object as usual and clears marked_for_destruction flag.

Callbacks - Included

#after_create

Registers a callback to be called after a record is created.
#after_destroy

Registers a callback to be called after a record is destroyed.
#after_find

Registers a callback to be called after a record is instantiated via a finder.
#after_initialize

Registers a callback to be called after a record is instantiated.
#after_save

Registers a callback to be called after a record is saved.
#after_touch

Registers a callback to be called after a record is touched.
#after_update

Registers a callback to be called after a record is updated.
#around_create

Registers a callback to be called around the creation of a record.
#around_destroy

Registers a callback to be called around the destruction of a record.
#around_save

Registers a callback to be called around the save of a record.
#around_update

Registers a callback to be called around the update of a record.
#before_create

Registers a callback to be called before a record is created.
#before_destroy

Registers a callback to be called before a record is destroyed.
#before_save

Registers a callback to be called before a record is saved.
#before_update

Registers a callback to be called before a record is updated.

AttributeMethods::Dirty - self

#attribute_before_last_save

Returns the original value of an attribute before the last save.
#attribute_change_to_be_saved

Returns the change to an attribute that will be persisted during the next save.
#attribute_in_database

Returns the value of an attribute in the database, as opposed to the in-memory value that will be persisted the next time the record is saved.
#attributes_in_database

Returns a hash of the attributes that will change when the record is next saved.
#changed_attribute_names_to_save

Returns an array of the names of any attributes that will change when the record is next saved.
#changes_to_save

Returns a hash containing all the changes that will be persisted during the next save.
#reload

reload the record and clears changed attributes.
#saved_change_to_attribute

Returns the change to an attribute during the last save.
#saved_change_to_attribute?

Did this attribute change when we last saved?
#saved_changes

Returns a hash containing all the changes that were just saved.
#will_save_change_to_attribute?

Will this attribute change the next time we save?

::ActiveModel::Dirty - Included

#changed

Returns an array with the name of the attributes with unsaved changes.
#changed_attributes

Returns a hash of the attributes with unsaved changes indicating their original values like attr => original value.
#changes

Returns a hash of changed attributes indicating their original and new values like attr => [original value, new value].
#changes_applied

Clears dirty data and moves changes to previous_changes and mutations_from_database to mutations_before_last_save respectively.
#clear_attribute_changes,
#clear_changes_information

Clears all dirty data: current changes and previous changes.
#previous_changes

Returns a hash of attributes that were changed before the model was saved.
#restore_attributes

Restore all previous data of the provided attributes.

AttributeMethods::PrimaryKey - self

#id_before_type_cast

Returns the primary key column’s value before type cast.
#id_in_database

Returns the primary key column’s value from the database.
#id_was

Returns the primary key column’s previous value.
#to_key

Returns this record’s primary key value wrapped in an array if one is available.

AttributeMethods::Query - self

#query_attribute

AttributeMethods::BeforeTypeCast - self

#attributes_before_type_cast

Returns a hash of attributes before typecasting and deserialization.
#read_attribute_before_type_cast

Returns the value of the attribute identified by attr_name before typecasting and deserialization.

AttributeMethods::Write - self

#write_attribute

Updates the attribute identified by attr_name with the specified value.

AttributeMethods::Read - self

#_read_attribute

This method exists to avoid the expensive primary_key check internally, without breaking compatibility with the read_attribute API.
#read_attribute

Returns the value of the attribute identified by attr_name after it has been typecast (for example, “2004-12-12” in a date column is cast to a date object, like Date.new(2004, 12, 12)).

AttributeMethods - Included

#[]

Returns the value of the attribute identified by attr_name after it has been typecast (for example, “2004-12-12” in a date column is cast to a date object, like Date.new(2004, 12, 12)).
#[]=

Updates the attribute identified by attr_name with the specified value.
#accessed_fields

Returns the name of all database fields which have been read from this model.
#attribute_for_inspect

Returns an #inspect-like string for the value of the attribute attr_name.
#attribute_names

Returns an array of names for the attributes available on this object.
#attribute_present?

Returns true if the specified attribute has been set by the user or by a database load and is neither nil nor empty? (the latter only applies to objects that respond to empty?, most notably Strings).
#attributes

Returns a hash of all the attributes with their names as keys and the values of the attributes as values.
#has_attribute?

Returns true if the given attribute is in the attributes hash, otherwise false.
#respond_to?

A Person object with a name attribute can ask person.respond_to?(:name), person.respond_to?(:name=), and person.respond_to?(:name?) which will all return true.

::ActiveModel::AttributeMethods - Included

#attribute_missing

attribute_missing is like method_missing, but for attributes.
#method_missing

Allows access to the object attributes, which are held in the hash returned by attributes, as though they were first-class methods.
#respond_to?,
#respond_to_without_attributes?

A Person instance with a name attribute can ask person.respond_to?(:name), person.respond_to?(:name=), and person.respond_to?(:name?) which will all return true.

Locking::Pessimistic - Included

#lock!

Obtain a row lock on this record.
#with_lock

Wraps the passed block in a transaction, locking the object before yielding.

Validations - Included

#save

The validation process on save can be skipped by passing validate: false.
#save!

Attempts to save the record just like {ActiveRecord::Base#save} but will raise an RecordInvalid exception instead of returning false if the record is not valid.
#valid?

Runs all the validations within the specified context.
#validate

Alias for Validations#valid?.

::ActiveModel::Validations - Included

#errors

Returns the Errors object that holds all information about attribute error messages.
#invalid?

Performs the opposite of valid?.
#read_attribute_for_validation

Hook method defining how an attribute value should be retrieved.
#valid?

Runs all the specified validations and returns true if no errors were added otherwise false.
#validate

Alias for ActiveModel::Validations#valid?.
#validate!

Runs all the validations within the specified context.
#validates_with

Passes the record off to the class or classes specified and allows them to add errors based on more complex conditions.
#raise_validation_error

Integration - Included

#cache_key

Returns a stable cache key that can be used to identify this record.
#cache_key_with_version

Returns a cache key along with the version.
#cache_version

Returns a cache version that can be used together with the cache key to form a recyclable caching scheme.
#to_param

Returns a ::String, which Action Pack uses for constructing a URL to this object.

::ActiveModel::Conversion - Included

#to_key

Returns an ::Array of all key attributes if any of the attributes is set, whether or not the object is persisted.
#to_model

If your object is already designed to implement all of the Active Model you can use the default :to_model implementation, which simply returns self.
#to_param

Returns a string representing the object’s key suitable for use in URLs, or nil if persisted? is false.
#to_partial_path

Returns a string identifying the path associated with the object.

::ActiveModel::AttributeAssignment - Included

#assign_attributes

Allows you to set all the attributes by passing in a hash of attributes with keys matching the attribute names.

Inheritance - Included

#initialize_dup

Persistence - Included

#becomes

Returns an instance of the specified klass with the attributes of the current record.
#becomes!

Wrapper around #becomes that also changes the instance’s sti column value.
#decrement

Initializes attribute to zero if nil and subtracts the value passed as by (default is 1).
#decrement!

Wrapper around #decrement that writes the update to the database.
#delete

Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can’t be persisted).
#destroy

Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can’t be persisted).
#destroy!

Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can’t be persisted).
#increment

Initializes attribute to zero if nil and adds the value passed as by (default is 1).
#increment!

Wrapper around #increment that writes the update to the database.
#reload

Reloads the record from the database.
#save

Saves the model.
#save!

Saves the model.
#toggle

Assigns to attribute the boolean opposite of attribute?.
#toggle!

Wrapper around #toggle that saves the record.
#touch

Saves the record with the updated_at/on attributes set to the current time or the time specified.
#update

Updates the attributes of the model from the passed-in hash and saves the record, all wrapped in a transaction.
#update!

Updates its receiver just like #update but calls #save! instead of save, so an exception is raised if the record is invalid and saving will fail.
#update_attribute

Updates a single attribute and saves the record.
#update_column

Equivalent to update_columns(name => value).
#update_columns

Updates the attributes directly in the database issuing an UPDATE SQL statement and sets them in the receiver:

Core - Included

#<=>

Allows sort on objects.
#==

Returns true if comparison_object is the same exact object, or comparison_object is of the same type and self has an ID and it is equal to comparison_object.id.
#clone

Identical to Ruby’s clone method.
#connection_handler,
#dup

Duped objects have no id assigned and are treated as new records.
#encode_with

Populate coder with attributes about this record that should be serialized.
#eql?

Alias for Core#==.
#freeze

Clone and freeze the attributes hash such that associations are still accessible, even on destroyed records, but cloned models will not be frozen.
#hash

Delegates to id in order to allow two records of the same type and id to work with something like:
#init_with

Initialize an empty model object from coder.
#initialize

New objects can be instantiated as either empty (pass no construction parameter) or pre-set with attributes but not yet saved (pass a hash with key names matching the associated table column names).
#inspect

Returns the contents of the record as a nicely formatted string.
#inspection_filter,
#pretty_print

Takes a PP and prettily prints this record to it, allowing you to get a nice result from pp record when pp is required.
#readonly!

Marks this record as read only.
#slice

Returns a hash of the given methods with their names as keys and returned values as values.
#strict_loading!

Sets the record to strict_loading mode.
#values_at

Returns an array of the values returned by the given methods.

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class ActiveModel::AttributeMethods

Class Attribute Details

._attr_readonly (rw)

[ GitHub ] 

  


# File 'activerecord/lib/active_record/readonly_attributes.rb', line 8



class_attribute :_attr_readonly, instance_accessor: false, default: []


  








  

    ._attr_readonly?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/readonly_attributes.rb', line 8



class_attribute :_attr_readonly, instance_accessor: false, default: []


  








  

    ._reflections   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 11



class_attribute :_reflections, instance_writer: false, default: {}


  








  

    ._reflections?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 11



class_attribute :_reflections, instance_writer: false, default: {}


  








  

    .action_on_strict_loading_violation   (rw)
  



  

    

Set the application to log or raise when an association violates strict loading. Defaults to :raise.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 140



mattr_accessor :action_on_strict_loading_violation, instance_accessor: false, default: :raise


  








  

    .aggregate_reflections   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 12



class_attribute :aggregate_reflections, instance_writer: false, default: {}


  








  

    .aggregate_reflections?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 12



class_attribute :aggregate_reflections, instance_writer: false, default: {}


  








  

    .attributes_to_define_after_schema_loads   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attributes.rb', line 11



class_attribute :attributes_to_define_after_schema_loads, instance_accessor: false, default: {} # :internal:


  








  

    .attributes_to_define_after_schema_loads?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/attributes.rb', line 11



class_attribute :attributes_to_define_after_schema_loads, instance_accessor: false, default: {} # :internal:


  








  

    .belongs_to_required_by_default   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 134



class_attribute :belongs_to_required_by_default, instance_accessor: false


  








  

    .belongs_to_required_by_default?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 134



class_attribute :belongs_to_required_by_default, instance_accessor: false


  








  

    .cache_timestamp_format   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 16



class_attribute :cache_timestamp_format, instance_writer: false, default: :usec


  








  

    .cache_timestamp_format?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 16



class_attribute :cache_timestamp_format, instance_writer: false, default: :usec


  








  

    .cache_versioning   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 24



class_attribute :cache_versioning, instance_writer: false, default: false


  








  

    .cache_versioning?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 24



class_attribute :cache_versioning, instance_writer: false, default: false


  








  

    .collection_cache_versioning   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 32



class_attribute :collection_cache_versioning, instance_writer: false, default: false


  








  

    .collection_cache_versioning?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 32



class_attribute :collection_cache_versioning, instance_writer: false, default: false


  








  

    .configurations   (rw)
  



  

    

Returns fully resolved DatabaseConfigurations object


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 69



def self.configurations
  @@configurations
end


  








  

    .configurations=(config)   (rw)
  



  

    

Contains the database configuration - as is typically stored in config/database.yml - as an DatabaseConfigurations object.



For example, the following database.yml…



development:
  adapter: sqlite3
  database: db/development.sqlite3

production:
  adapter: sqlite3
  database: db/production.sqlite3



…would result in .configurations to look like this:



#<ActiveRecord::DatabaseConfigurations:0x00007fd1acbdf800 @configurations=[
  #<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbded10 @env_name="development",
    @name="primary", @config={adapter: "sqlite3", database: "db/development.sqlite3"}>,
  #<ActiveRecord::DatabaseConfigurations::HashConfig:0x00007fd1acbdea90 @env_name="production",
    @name="primary", @config={adapter: "sqlite3", database: "db/production.sqlite3"}>
]>


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 63



def self.configurations=(config)
  @@configurations = ActiveRecord::DatabaseConfigurations.new(config)
end


  








  

    .connection_class   (rw)
  



  

    

:nodoc


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 276



def self.connection_class # :nodoc
  @connection_class ||= false
end


  








  

    .connection_handler   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 175



def self.connection_handler
  Thread.current.thread_variable_get(:ar_connection_handler) || default_connection_handler
end


  








  

    .connection_handler=(handler)   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 179



def self.connection_handler=(handler)
  Thread.current.thread_variable_set(:ar_connection_handler, handler)
end


  








  

    .connection_handlers   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 183



def self.connection_handlers
  unless legacy_connection_handling
    raise NotImplementedError, "The new connection handling does not support accessing multiple connection handlers."
  end

  @@connection_handlers ||= {}
end


  








  

    .connection_handlers=(handlers)   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 191



def self.connection_handlers=(handlers)
  unless legacy_connection_handling
    raise NotImplementedError, "The new connection handling does not setting support multiple connection handlers."
  end

  @@connection_handlers = handlers
end


  








  

    .default_connection_handler   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 150



class_attribute :default_connection_handler, instance_writer: false


  








  

    .default_connection_handler?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 150



class_attribute :default_connection_handler, instance_writer: false


  








  

    .default_role   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 152



class_attribute :default_role, instance_writer: false


  








  

    .default_role?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 152



class_attribute :default_role, instance_writer: false


  








  

    .default_shard   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 154



class_attribute :default_shard, instance_writer: false


  








  

    .default_shard?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 154



class_attribute :default_shard, instance_writer: false


  








  

    .default_timezone   (rw)
    Also known as: #default_timezone
  



  

    

Determines whether to use Time.utc (using :utc) or Time.local (using :local) when pulling dates and times from the database. This is set to :utc by default.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 77



mattr_accessor :default_timezone, instance_writer: false, default: :utc


  








  

    .destroy_association_async_job   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 39



class_attribute :destroy_association_async_job, instance_writer: false, instance_predicate: false, default: false


  








  

    .dump_schema_after_migration   (rw)
    Also known as: #dump_schema_after_migration
  



  

    

Specify whether schema dump should happen at the end of the db:migrate rails command. This is true by default, which is useful for the development environment. This should ideally be false in the production environment where dumping schema is rarely needed.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 107



mattr_accessor :dump_schema_after_migration, instance_writer: false, default: true


  








  

    .dump_schemas   (rw)
    Also known as: #dump_schemas
  



  

    

Specifies which database schemas to dump when calling db:schema:dump. If the value is :schema_search_path (the default), any schemas listed in schema_search_path are dumped. Use :all to dump all schemas regardless of schema_search_path, or a string of comma separated schemas for a custom list.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 116



mattr_accessor :dump_schemas, instance_writer: false, default: :schema_search_path


  








  

    .error_on_ignored_order   (rw)
    Also known as: #error_on_ignored_order
  



  

    

Specifies if an error should be raised if the query has an order being ignored when doing batch queries. Useful in applications where the scope being ignored is error-worthy, rather than a warning.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 94



mattr_accessor :error_on_ignored_order, instance_writer: false, default: false


  








  

    .has_many_inversing   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 148



mattr_accessor :has_many_inversing, instance_accessor: false, default: false


  








  

    .immutable_strings_by_default   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 138



class_attribute :immutable_strings_by_default, instance_accessor: false


  








  

    .immutable_strings_by_default?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 138



class_attribute :immutable_strings_by_default, instance_accessor: false


  








  

    .implicit_order_column   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 137



class_attribute :implicit_order_column, instance_accessor: false


  








  

    .implicit_order_column?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 137



class_attribute :implicit_order_column, instance_accessor: false


  








  

    .index_nested_attribute_errors   (rw)
    Also known as: #index_nested_attribute_errors
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/autosave_association.rb', line 153



mattr_accessor :index_nested_attribute_errors, instance_writer: false, default: false


  








  

    .internal_metadata_table_name   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 135



class_attribute :internal_metadata_table_name, instance_accessor: false, default: "ar_internal_metadata"


  








  

    .internal_metadata_table_name?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 135



class_attribute :internal_metadata_table_name, instance_accessor: false, default: "ar_internal_metadata"


  








  

    .legacy_connection_handling   (rw)
    Also known as: #legacy_connection_handling
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 156



mattr_accessor :legacy_connection_handling, instance_writer: false, default: true


  








  

    .local_stored_attributes   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/store.rb', line 99



attr_accessor :local_stored_attributes


  








  

    .lock_optimistically   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/locking/optimistic.rb', line 56



class_attribute :lock_optimistically, instance_writer: false, default: true


  








  

    .lock_optimistically?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/locking/optimistic.rb', line 56



class_attribute :lock_optimistically, instance_writer: false, default: true


  








  

    .logger   (rw)
    Also known as: #logger
  



  

    

Accepts a logger conforming to the interface of Log4r which is then passed on to any new database connections made and which can be retrieved on both a class and instance level by calling logger.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 20



mattr_accessor :logger, instance_writer: false


  








  

    .maintain_test_schema   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 132



mattr_accessor :maintain_test_schema, instance_accessor: false


  








  

    .nested_attributes_options   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/nested_attributes.rb', line 15



class_attribute :nested_attributes_options, instance_writer: false, default: {}


  








  

    .nested_attributes_options?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/nested_attributes.rb', line 15



class_attribute :nested_attributes_options, instance_writer: false, default: {}


  








  

    .pluralize_table_names   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 136



class_attribute :pluralize_table_names, instance_writer: false, default: true


  








  

    .pluralize_table_names?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 136



class_attribute :pluralize_table_names, instance_writer: false, default: true


  








  

    .primary_key_prefix_type   (rw)
    Also known as: #primary_key_prefix_type
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 130



mattr_accessor :primary_key_prefix_type, instance_writer: false


  








  

    .queues   (rw)
  



  

    

Specifies the names of the queues used by background jobs.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 33



mattr_accessor :queues, instance_accessor: false, default: {}


  








  

    .raise_int_wider_than_64bit   (rw)
    Also known as: #raise_int_wider_than_64bit
  



  

    

Application configurable boolean that denotes whether or not to raise an exception when the PostgreSQLAdapter is provided with an integer that is wider than signed 64bit representation


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 171



mattr_accessor :raise_int_wider_than_64bit, instance_writer: false, default: true


  








  

    .reading_role   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 146



mattr_accessor :reading_role, instance_accessor: false, default: :reading


  








  

    .record_timestamps   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/timestamp.rb', line 47



class_attribute :record_timestamps, default: true


  








  

    .record_timestamps?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/timestamp.rb', line 47



class_attribute :record_timestamps, default: true


  








  

    .schema_format   (rw)
    Also known as: #schema_format
  



  

    

Specifies the format to use when dumping the database schema with Rails’ Rakefile. If :sql, the schema is dumped as (potentially database- specific) SQL statements. If :ruby, the schema is dumped as an Schema file which can be loaded into any database that supports migrations. Use :ruby if you want to have different database adapters for, e.g., your development and test environments.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 87



mattr_accessor :schema_format, instance_writer: false, default: :ruby


  








  

    .schema_migrations_table_name   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 134



class_attribute :schema_migrations_table_name, instance_accessor: false, default: "schema_migrations"


  








  

    .schema_migrations_table_name?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 134



class_attribute :schema_migrations_table_name, instance_accessor: false, default: "schema_migrations"


  








  

    .signed_id_verifier_secret   (rw)
    Also known as: #signed_id_verifier_secret
  



  

    

Set the secret used for the signed id verifier instance when using Active Record outside of ::Rails. Within Rails, this is automatically set using the ::Rails application key generator.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/signed_id.rb', line 13



mattr_accessor :signed_id_verifier_secret, instance_writer: false


  








  

    .store_full_class_name   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 41



class_attribute :store_full_class_name, instance_writer: false, default: true


  








  

    .store_full_class_name?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 41



class_attribute :store_full_class_name, instance_writer: false, default: true


  








  

    .store_full_sti_class   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 45



class_attribute :store_full_sti_class, instance_writer: false, default: true


  








  

    .store_full_sti_class?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 45



class_attribute :store_full_sti_class, instance_writer: false, default: true


  








  

    .strict_loading_by_default   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 142



class_attribute :strict_loading_by_default, instance_accessor: false, default: false


  








  

    .strict_loading_by_default?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 142



class_attribute :strict_loading_by_default, instance_accessor: false, default: false


  








  

    .suppress_multiple_database_warning   (rw)
    Also known as: #suppress_multiple_database_warning
  



  

    

Show a warning when ::Rails couldn’t parse your database.yml for multiple databases.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 130



mattr_accessor :suppress_multiple_database_warning, instance_writer: false, default: false


  








  

    .table_name_prefix   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 132



class_attribute :table_name_prefix, instance_writer: false, default: ""


  








  

    .table_name_prefix?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 132



class_attribute :table_name_prefix, instance_writer: false, default: ""


  








  

    .table_name_suffix   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 133



class_attribute :table_name_suffix, instance_writer: false, default: ""


  








  

    .table_name_suffix?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 133



class_attribute :table_name_suffix, instance_writer: false, default: ""


  








  

    .timestamped_migrations   (rw)
    Also known as: #timestamped_migrations
  



  

    

Specify whether or not to use timestamps for migration versions


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 99



mattr_accessor :timestamped_migrations, instance_writer: false, default: true


  








  

    .use_yaml_unsafe_load   (rw)
    Also known as: #use_yaml_unsafe_load
  



  

    

Application configurable boolean that instructs the YAML Coder to use an unsafe load if set to true.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 160



mattr_accessor :use_yaml_unsafe_load, instance_writer: false, default: false


  








  

    .verbose_query_logs   (rw)
    Also known as: #verbose_query_logs
  



  

    

Specifies if the methods calling database queries should be logged below their relevant queries. Defaults to false.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 27



mattr_accessor :verbose_query_logs, instance_writer: false, default: false


  








  

    .warn_on_records_fetched_greater_than   (rw)
    Also known as: #warn_on_records_fetched_greater_than
  



  

    

Specify a threshold for the size of query result sets. If the number of records in the set exceeds the threshold, a warning is logged. This can be used to identify queries which load thousands of records and potentially cause memory bloat.


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 124



mattr_accessor :warn_on_records_fetched_greater_than, instance_writer: false


  








  

    .writing_role   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 144



mattr_accessor :writing_role, instance_accessor: false, default: :writing


  








  

    .yaml_column_permitted_classes   (rw)
    Also known as: #yaml_column_permitted_classes
  



  

    

Application configurable array that provides additional permitted classes to Psych safe_load in the YAML Coder


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 164



mattr_accessor :yaml_column_permitted_classes, instance_writer: false, default: [Symbol]


  







Class Method Details



  

    .after_commit  
  



  

    

See Active Record Callbacks.


  









  

    .after_create  
  



  

    

See Active Record Callbacks.


  









  

    .after_destroy  
  



  

    

See Active Record Callbacks.


  









  

    .after_find  
  



  

    

See Active Record Callbacks.


  









  

    .after_initialize  
  



  

    

See Active Record Callbacks.


  









  

    .after_rollback  
  



  

    

See Active Record Callbacks.


  









  

    .after_save  
  



  

    

See Active Record Callbacks.


  









  

    .after_touch  
  



  

    

See Active Record Callbacks.


  









  

    .after_update  
  



  

    

See Active Record Callbacks.


  









  

    .around_create  
  



  

    

See Active Record Callbacks.


  









  

    .around_destroy  
  



  

    

See Active Record Callbacks.


  









  

    .around_save  
  



  

    

See Active Record Callbacks.


  









  

    .around_update  
  



  

    

See Active Record Callbacks.


  









  

    .before_create  
  



  

    

See Active Record Callbacks.


  









  

    .before_destroy  
  



  

    

See Active Record Callbacks.


  









  

    .before_save  
  



  

    

See Active Record Callbacks.


  









  

    .before_update  
  



  

    

See Active Record Callbacks.


  









  

    .current_preventing_writes  
  



  

    

Returns the symbol representing the current setting for preventing writes.



ActiveRecord::Base.connected_to(role: :reading) do
  ActiveRecord::Base.current_preventing_writes #=> true
end

ActiveRecord::Base.connected_to(role: :writing) do
  ActiveRecord::Base.current_preventing_writes #=> false
end


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 249



def self.current_preventing_writes
  if legacy_connection_handling
    connection_handler.prevent_writes
  else
    connected_to_stack.reverse_each do |hash|
      return hash[:prevent_writes] if !hash[:prevent_writes].nil? && hash[:klasses].include?(Base)
      return hash[:prevent_writes] if !hash[:prevent_writes].nil? && hash[:klasses].include?(connection_classes)
    end

    false
  end
end


  








  

    .current_role  
  



  

    

Returns the symbol representing the current connected role.



ActiveRecord::Base.connected_to(role: :writing) do
  ActiveRecord::Base.current_role #=> :writing
end

ActiveRecord::Base.connected_to(role: :reading) do
  ActiveRecord::Base.current_role #=> :reading
end


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 208



def self.current_role
  if ActiveRecord::Base.legacy_connection_handling
    connection_handlers.key(connection_handler) || default_role
  else
    connected_to_stack.reverse_each do |hash|
      return hash[:role] if hash[:role] && hash[:klasses].include?(Base)
      return hash[:role] if hash[:role] && hash[:klasses].include?(connection_classes)
    end

    default_role
  end
end


  








  

    .current_shard  
  



  

    

Returns the symbol representing the current connected shard.



ActiveRecord::Base.connected_to(role: :reading) do
  ActiveRecord::Base.current_shard #=> :default
end

ActiveRecord::Base.connected_to(role: :writing, shard: :one) do
  ActiveRecord::Base.current_shard #=> :one
end


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 230



def self.current_shard
  connected_to_stack.reverse_each do |hash|
    return hash[:shard] if hash[:shard] && hash[:klasses].include?(Base)
    return hash[:shard] if hash[:shard] && hash[:klasses].include?(connection_classes)
  end

  default_shard
end


  







Instance Attribute Details



  

    #_reflections   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 11



class_attribute :_reflections, instance_writer: false, default: {}


  








  

    #_reflections?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 11



class_attribute :_reflections, instance_writer: false, default: {}


  








  

    #aggregate_reflections   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 12



class_attribute :aggregate_reflections, instance_writer: false, default: {}


  








  

    #aggregate_reflections?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/reflection.rb', line 12



class_attribute :aggregate_reflections, instance_writer: false, default: {}


  








  

    #cache_timestamp_format   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 16



class_attribute :cache_timestamp_format, instance_writer: false, default: :usec


  








  

    #cache_timestamp_format?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 16



class_attribute :cache_timestamp_format, instance_writer: false, default: :usec


  








  

    #cache_versioning   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 24



class_attribute :cache_versioning, instance_writer: false, default: false


  








  

    #cache_versioning?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 24



class_attribute :cache_versioning, instance_writer: false, default: false


  








  

    #collection_cache_versioning   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 32



class_attribute :collection_cache_versioning, instance_writer: false, default: false


  








  

    #collection_cache_versioning?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/integration.rb', line 32



class_attribute :collection_cache_versioning, instance_writer: false, default: false


  








  

    #column_for_attribute   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 144



delegate :type_for_attribute, :column_for_attribute, to: :class


  








  

    #default_connection_handler   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 150



class_attribute :default_connection_handler, instance_writer: false


  








  

    #default_connection_handler?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 150



class_attribute :default_connection_handler, instance_writer: false


  








  

    #default_role   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 152



class_attribute :default_role, instance_writer: false


  








  

    #default_role?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 152



class_attribute :default_role, instance_writer: false


  








  

    #default_shard   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 154



class_attribute :default_shard, instance_writer: false


  








  

    #default_shard?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 154



class_attribute :default_shard, instance_writer: false


  








  

    #default_timezone   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 77



mattr_accessor :default_timezone, instance_writer: false, default: :utc


  








  

    #destroy_association_async_job   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 39



class_attribute :destroy_association_async_job, instance_writer: false, instance_predicate: false, default: false


  








  

    #dump_schema_after_migration   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 107



mattr_accessor :dump_schema_after_migration, instance_writer: false, default: true


  








  

    #dump_schemas   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 116



mattr_accessor :dump_schemas, instance_writer: false, default: :schema_search_path


  








  

    #error_on_ignored_order   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 94



mattr_accessor :error_on_ignored_order, instance_writer: false, default: false


  








  

    #index_nested_attribute_errors   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/autosave_association.rb', line 153



mattr_accessor :index_nested_attribute_errors, instance_writer: false, default: false


  








  

    #legacy_connection_handling   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 156



mattr_accessor :legacy_connection_handling, instance_writer: false, default: true


  








  

    #lock_optimistically   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/locking/optimistic.rb', line 56



class_attribute :lock_optimistically, instance_writer: false, default: true


  








  

    #lock_optimistically?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/locking/optimistic.rb', line 56



class_attribute :lock_optimistically, instance_writer: false, default: true


  








  

    #logger   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 20



mattr_accessor :logger, instance_writer: false


  








  

    #nested_attributes_options   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/nested_attributes.rb', line 15



class_attribute :nested_attributes_options, instance_writer: false, default: {}


  








  

    #nested_attributes_options?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/nested_attributes.rb', line 15



class_attribute :nested_attributes_options, instance_writer: false, default: {}


  








  

    #pluralize_table_names   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 136



class_attribute :pluralize_table_names, instance_writer: false, default: true


  








  

    #pluralize_table_names?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 136



class_attribute :pluralize_table_names, instance_writer: false, default: true


  








  

    #primary_key_prefix_type   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 130



mattr_accessor :primary_key_prefix_type, instance_writer: false


  








  

    #raise_int_wider_than_64bit   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 171



mattr_accessor :raise_int_wider_than_64bit, instance_writer: false, default: true


  








  

    #record_timestamps   (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/timestamp.rb', line 47



class_attribute :record_timestamps, default: true


  








  

    #record_timestamps?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/timestamp.rb', line 47



class_attribute :record_timestamps, default: true


  








  

    #schema_format   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 87



mattr_accessor :schema_format, instance_writer: false, default: :ruby


  








  

    #signed_id_verifier_secret   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/signed_id.rb', line 13



mattr_accessor :signed_id_verifier_secret, instance_writer: false


  








  

    #store_full_class_name   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 41



class_attribute :store_full_class_name, instance_writer: false, default: true


  








  

    #store_full_class_name?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 41



class_attribute :store_full_class_name, instance_writer: false, default: true


  








  

    #store_full_sti_class   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 45



class_attribute :store_full_sti_class, instance_writer: false, default: true


  








  

    #store_full_sti_class?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/inheritance.rb', line 45



class_attribute :store_full_sti_class, instance_writer: false, default: true


  








  

    #suppress_multiple_database_warning   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 130



mattr_accessor :suppress_multiple_database_warning, instance_writer: false, default: false


  








  

    #table_name_prefix   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 132



class_attribute :table_name_prefix, instance_writer: false, default: ""


  








  

    #table_name_prefix?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 132



class_attribute :table_name_prefix, instance_writer: false, default: ""


  








  

    #table_name_suffix   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 133



class_attribute :table_name_suffix, instance_writer: false, default: ""


  








  

    #table_name_suffix?  ⇒ Boolean  (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 133



class_attribute :table_name_suffix, instance_writer: false, default: ""


  








  

    #timestamped_migrations   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 99



mattr_accessor :timestamped_migrations, instance_writer: false, default: true


  








  

    #type_for_attribute   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/model_schema.rb', line 144



delegate :type_for_attribute, :column_for_attribute, to: :class


  








  

    #use_yaml_unsafe_load   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 160



mattr_accessor :use_yaml_unsafe_load, instance_writer: false, default: false


  








  

    #verbose_query_logs   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 27



mattr_accessor :verbose_query_logs, instance_writer: false, default: false


  








  

    #warn_on_records_fetched_greater_than   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 124



mattr_accessor :warn_on_records_fetched_greater_than, instance_writer: false


  








  

    #yaml_column_permitted_classes   (readonly)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/core.rb', line 164



mattr_accessor :yaml_column_permitted_classes, instance_writer: false, default: [Symbol]