Class: ActiveRecord::Base

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses: ActiveRecord::InternalMetadata, ActiveRecord::SchemaMigration
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `::ActiveModel::Callbacks`, `CollectionCacheKey`, `Enum`, `Explain`, `Translation`, `::ActiveModel::Translation`, `Querying`, `QueryCache::ClassMethods`, `ConnectionHandling`, `::ActiveSupport::DescendantsTracker`, `::ActiveSupport::Benchmarkable`, `::ActiveModel::Naming`
Instance Chain: self, `Suppressor`, `SecureToken`, `Store`, `Serialization`, `::ActiveModel::Serializers::JSON`, `::ActiveModel::Serialization`, `NoTouching`, `TouchLater`, `Transactions`, `Aggregations`, `AutosaveAssociation`, `::ActiveModel::SecurePassword`, `Timestamp`, `Callbacks`, `AttributeMethods::Serialization`, `AttributeMethods::Dirty`, `::ActiveModel::Dirty`, `AttributeMethods::TimeZoneConversion`, `AttributeMethods::PrimaryKey`, `AttributeMethods::Query`, `AttributeMethods::BeforeTypeCast`, `AttributeMethods::Write`, `AttributeMethods::Read`, `AttributeMethods`, `::ActiveModel::AttributeMethods`, `::ActiveModel::Validations::Callbacks`, `DefineCallbacks`, `Locking::Pessimistic`, `Locking::Optimistic`, `Attributes`, `CounterCache`, `Validations`, `::ActiveModel::Validations`, `Integration`, `::ActiveModel::Conversion`, `AttributeAssignment`, `::ActiveModel::AttributeAssignment`, `Sanitization`, `Scoping::Named`, `Scoping::Default`, `Scoping`, `Inheritance`, `ModelSchema`, `ReadonlyAttributes`, `Persistence`, `Core`
Inherits:	Object
Defined in:	activerecord/lib/active_record/base.rb

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

Callback Registration

.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.

`AttributeDecorators` - Attributes & Methods

.attribute_type_decorations rw
.attribute_type_decorations? ⇒ Boolean rw

`AttributeMethods` - Attributes & Methods

#column_for_attribute readonly

`Attributes` - Attributes & Methods

.attributes_to_define_after_schema_loads rw
.attributes_to_define_after_schema_loads? ⇒ Boolean rw

`AutosaveAssociation` - Attributes & Methods

.index_nested_attribute_errors (also: #index_nested_attribute_errors) rw
#index_nested_attribute_errors readonly

`Core` - Attributes & Methods

.allow_unsafe_raw_sql (also: #allow_unsafe_raw_sql) rw

Specify the behavior for unsafe raw query methods.
#allow_unsafe_raw_sql readonly
.belongs_to_required_by_default rw
.configurations rw

Returns fully resolved configurations hash.
.configurations=(config) rw

Contains the database configuration - as is typically stored in config/database.yml - as a ::Hash.
.connection_handler rw
.connection_handler=(handler) rw
.default_connection_handler rw
#default_connection_handler readonly
.default_connection_handler? ⇒ Boolean rw
#default_connection_handler? ⇒ Boolean readonly
.default_timezone (also: #default_timezone) rw

Determines whether to use Time.utc (using :utc) or Time.local (using :local) when pulling dates and times from the database.
#default_timezone readonly
.dump_schema_after_migration (also: #dump_schema_after_migration) rw

Specify whether schema dump should happen at the end of the db:migrate rake task.
#dump_schema_after_migration readonly
.dump_schemas (also: #dump_schemas) rw

Specifies which database schemas to dump when calling db:structure:dump.
#dump_schemas readonly
.error_on_ignored_order (also: #error_on_ignored_order) rw

Specifies if an error should be raised if the query has an order being ignored when doing batch queries.
#error_on_ignored_order readonly
.logger (also: #logger) rw

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.
#logger readonly
.maintain_test_schema rw
.schema_format (also: #schema_format) rw

Specifies the format to use when dumping the database schema with Rails’ Rakefile.
#schema_format readonly
.timestamped_migrations (also: #timestamped_migrations) rw

Specify whether or not to use timestamps for migration versions.
#timestamped_migrations readonly
.use_yaml_unsafe_load (also: #use_yaml_unsafe_load) rw

Application configurable boolean that instructs the YAML Coder to use an unsafe load if set to true.
#use_yaml_unsafe_load readonly
.verbose_query_logs (also: #verbose_query_logs) rw

Specifies if the methods calling database queries should be logged below their relevant queries.
#verbose_query_logs readonly
.warn_on_records_fetched_greater_than (also: #warn_on_records_fetched_greater_than) rw

Specify a threshold for the size of query result sets.
#warn_on_records_fetched_greater_than readonly
.yaml_column_permitted_classes (also: #yaml_column_permitted_classes) rw

Application configurable array that provides additional permitted classes to Psych safe_load in the YAML Coder.
#yaml_column_permitted_classes readonly

`Inheritance` - Attributes & Methods

.store_full_sti_class rw
#store_full_sti_class readonly
.store_full_sti_class? ⇒ Boolean rw
#store_full_sti_class? ⇒ Boolean readonly

`Integration` - Attributes & Methods

.cache_timestamp_format rw
#cache_timestamp_format readonly
.cache_timestamp_format? ⇒ Boolean rw
#cache_timestamp_format? ⇒ Boolean readonly
.cache_versioning rw
#cache_versioning readonly
.cache_versioning? ⇒ Boolean rw
#cache_versioning? ⇒ Boolean readonly

`ModelSchema` - Attributes & Methods

.internal_metadata_table_name rw
.internal_metadata_table_name? ⇒ Boolean rw
.pluralize_table_names rw
#pluralize_table_names readonly
.pluralize_table_names? ⇒ Boolean rw
#pluralize_table_names? ⇒ Boolean readonly
.primary_key_prefix_type (also: #primary_key_prefix_type) rw
#primary_key_prefix_type readonly
.schema_migrations_table_name rw
.schema_migrations_table_name? ⇒ Boolean rw
.table_name_prefix rw
#table_name_prefix readonly
.table_name_prefix? ⇒ Boolean rw
#table_name_prefix? ⇒ Boolean readonly
.table_name_suffix rw
#table_name_suffix readonly
.table_name_suffix? ⇒ Boolean rw
#table_name_suffix? ⇒ Boolean readonly
#type_for_attribute readonly

`NestedAttributes` - Attributes & Methods

.nested_attributes_options rw
#nested_attributes_options readonly
.nested_attributes_options? ⇒ Boolean rw
#nested_attributes_options? ⇒ Boolean readonly

`ReadonlyAttributes` - Attributes & Methods

._attr_readonly rw
._attr_readonly? ⇒ Boolean rw

`Reflection` - Attributes & Methods

._reflections rw
#_reflections readonly
._reflections? ⇒ Boolean rw
#_reflections? ⇒ Boolean readonly
.aggregate_reflections rw
#aggregate_reflections readonly
.aggregate_reflections? ⇒ Boolean rw
#aggregate_reflections? ⇒ Boolean readonly

`Store` - Attributes & Methods

.local_stored_attributes rw

`Locking::Optimistic` - Attributes & Methods

.lock_optimistically rw
#lock_optimistically readonly
.lock_optimistically? ⇒ Boolean rw
#lock_optimistically? ⇒ Boolean readonly

Class Attribute Summary

`Querying` - Extended

average, calculate, count, create_with, delete_all, destroy_all, distinct, eager_load, except, extending, fifth, find, find_by, find_each, find_in_batches, find_or_create_by, find_or_initialize_by, first, first_or_create, first_or_initialize, forty_two, fourth, from, group, having, ids, in_batches, includes, joins, last, left_joins, left_outer_joins, limit, lock, maximum, merge, minimum, none, offset, or, order, pluck, preload, readonly, references, reorder, rewhere, second, second_to_last, select, sum, take, third, third_to_last, unscope, update_all, where

`ConnectionHandling` - Extended

connected?	Returns `true` if Active Record is connected.
connection_specification_name	Return the specification name from the current class or its parent.
connection_specification_name=

Class Method Summary

`Enum` - Extended

enum

`::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.

`Querying` - Extended

any?,
count_by_sql	Returns the result of an SQL statement that should only include a COUNT(*) in the SELECT part.
exists?, fifth!, find_by!,
find_by_sql	Executes a custom SQL query against your database and returns all the results.
find_or_create_by!, first!, first_or_create!, forty_two!, fourth!, last!, many?, none?, one?, second!, second_to_last!, take!, third!, third_to_last!

`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_reloadable_connections!,
connection	Returns the connection currently associated with the class.
connection_config	Returns the configuration of the associated connection as a hash:
connection_pool,
establish_connection	Establishes the connection to the database.
flush_idle_connections!, remove_connection, retrieve_connection

`::ActiveSupport::DescendantsTracker` - Extended

descendants, direct_descendants, inherited

`::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?

`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?	Alias for `changed?`
#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 have unsaved changes, `false` otherwise.

`AttributeMethods::PrimaryKey` - self

#id	Returns the primary key value.
#id=	Sets the primary key value.
#id?	Queries the primary key 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.

`Core` - Included

#frozen?	Returns `true` if the attributes hash has been frozen.
#readonly?	Returns `true` if the record is read only.

Instance Method Summary

`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

#add_to_transaction	Add the record to the current transaction so that the `#after_rollback` and `#after_commit` callbacks can be called.
#rollback_active_record_state!	Reset id and @new_record if the transaction rolls back.
#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.

`AttributeMethods::Dirty` - self

#attribute_before_last_save	Returns the original value of an attribute before the last save.
#attribute_change_to_be_saved	Alias for `attribute_change`
#attribute_in_database	Alias for `attribute_was`
#attributes_in_database	Alias for `changed_attributes`
#changed_attribute_names_to_save	Alias for `changed`
#changes_to_save	Alias for `changes`
#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? This method can be invoked as `saved_change_to_name?` instead of `saved_change_to_attribute?("name")`.
#saved_changes	Returns a hash containing all the changes that were just saved.
#will_save_change_to_attribute?	Alias for `attribute_changed?`

`::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 `previously_changed` 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 value before type cast.
#id_in_database,
#id_was	Returns the primary key 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

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_attributes	Alias for Persistence#update.
#update_attributes!	Alias for Persistence#update!.
#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.
#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.

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 12


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

._reflections? ⇒ `Boolean` (rw)

[ GitHub ]

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


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

.aggregate_reflections (rw)

[ GitHub ]

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


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

.aggregate_reflections? ⇒ `Boolean` (rw)

[ GitHub ]

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


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

.allow_unsafe_raw_sql (rw) Also known as: #allow_unsafe_raw_sql

Specify the behavior for unsafe raw query methods. Values are as follows

deprecated - Warnings are logged when unsafe raw SQL is passed to
             query methods.
disabled   - Unsafe raw SQL passed to query methods results in
             UnknownAttributeReference exception.

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 92


mattr_accessor :allow_unsafe_raw_sql, instance_writer: false, default: :deprecated

.attribute_type_decorations (rw)

[ GitHub ]

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


class_attribute :attribute_type_decorations, instance_accessor: false, default: TypeDecorator.new # :internal:

.attribute_type_decorations? ⇒ `Boolean` (rw)

[ GitHub ]

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


class_attribute :attribute_type_decorations, instance_accessor: false, default: TypeDecorator.new # :internal:

.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 126


mattr_accessor :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

.configurations (rw)

Returns fully resolved configurations hash

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 59


def self.configurations
  @@configurations
end

.configurations=(config) (rw)

Contains the database configuration - as is typically stored in config/database.yml - as a ::Hash.

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:

{
   'development' => {
      'adapter'  => 'sqlite3',
      'database' => 'db/development.sqlite3'
   },
   'production' => {
      'adapter'  => 'sqlite3',
      'database' => 'db/production.sqlite3'
   }
}

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 53


def self.configurations=(config)
  @@configurations = ActiveRecord::ConnectionHandling::MergeAndResolveDefaultUrlConfig.new(config).resolve
end

.connection_handler (rw)

[ GitHub ]

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


def self.connection_handler
  ActiveRecord::RuntimeRegistry.connection_handler || default_connection_handler
end

.connection_handler=(handler) (rw)

[ GitHub ]

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


def self.connection_handler=(handler)
  ActiveRecord::RuntimeRegistry.connection_handler = handler
end

.default_connection_handler (rw)

[ GitHub ]

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


class_attribute :default_connection_handler, instance_writer: false

.default_connection_handler? ⇒ `Boolean` (rw)

[ GitHub ]

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


class_attribute :default_connection_handler, 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 67


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

.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 rake task. 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 105


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:structure: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 114


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 84


mattr_accessor :error_on_ignored_order, instance_writer: false, default: false

.index_nested_attribute_errors (rw) Also known as: #index_nested_attribute_errors

[ GitHub ]

# File 'activerecord/lib/active_record/autosave_association.rb', line 145


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 111


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 111


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

.local_stored_attributes (rw)

[ GitHub ]

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


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 18


mattr_accessor :logger, instance_writer: false

.maintain_test_schema (rw)

[ GitHub ]

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


mattr_accessor :maintain_test_schema, instance_accessor: false

.nested_attributes_options (rw)

[ GitHub ]

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


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

.nested_attributes_options? ⇒ `Boolean` (rw)

[ GitHub ]

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


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

.pluralize_table_names (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 112


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 112


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 106


mattr_accessor :primary_key_prefix_type, instance_writer: false

.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 77


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

.schema_migrations_table_name (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 110


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 110


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

.store_full_sti_class (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/inheritance.rb', line 43


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 43


class_attribute :store_full_sti_class, instance_writer: false, default: true

.table_name_prefix (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 108


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

.table_name_prefix? ⇒ `Boolean` (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 108


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

.table_name_suffix (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 109


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

.table_name_suffix? ⇒ `Boolean` (rw)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 109


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 97


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 132


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 25


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 122


mattr_accessor :warn_on_records_fetched_greater_than, instance_writer: false

.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 136


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

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.

Instance Attribute Details

#_reflections (readonly)

[ GitHub ]

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


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

#_reflections? ⇒ `Boolean` (readonly)

[ GitHub ]

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


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

#aggregate_reflections (readonly)

[ GitHub ]

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


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

#aggregate_reflections? ⇒ `Boolean` (readonly)

[ GitHub ]

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


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

#allow_unsafe_raw_sql (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 92


mattr_accessor :allow_unsafe_raw_sql, instance_writer: false, default: :deprecated

#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

#column_for_attribute (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/attribute_methods.rb', line 22


delegate :column_for_attribute, to: :class

#default_connection_handler (readonly)

[ GitHub ]

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


class_attribute :default_connection_handler, instance_writer: false

#default_connection_handler? ⇒ `Boolean` (readonly)

[ GitHub ]

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


class_attribute :default_connection_handler, instance_writer: false

#default_timezone (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 67


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

#dump_schema_after_migration (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 105


mattr_accessor :dump_schema_after_migration, instance_writer: false, default: true

#dump_schemas (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 114


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 84


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 145


mattr_accessor :index_nested_attribute_errors, instance_writer: false, default: false

#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 18


mattr_accessor :logger, instance_writer: false

#nested_attributes_options (readonly)

[ GitHub ]

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


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

#nested_attributes_options? ⇒ `Boolean` (readonly)

[ GitHub ]

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


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

#pluralize_table_names (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 112


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 112


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 106


mattr_accessor :primary_key_prefix_type, instance_writer: false

#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 77


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

#store_full_sti_class (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/inheritance.rb', line 43


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 43


class_attribute :store_full_sti_class, instance_writer: false, default: true

#table_name_prefix (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 108


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

#table_name_prefix? ⇒ `Boolean` (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 108


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

#table_name_suffix (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 109


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

#table_name_suffix? ⇒ `Boolean` (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 109


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

#timestamped_migrations (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 97


mattr_accessor :timestamped_migrations, instance_writer: false, default: true

#type_for_attribute (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/model_schema.rb', line 118


delegate :type_for_attribute, to: :class

#use_yaml_unsafe_load (readonly)

[ GitHub ]

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


mattr_accessor :use_yaml_unsafe_load, instance_writer: false, default: false

#verbose_query_logs (readonly)

[ GitHub ]

# File 'activerecord/lib/active_record/core.rb', line 25


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 122


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 136


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

Class: ActiveRecord::Base

Overview

Creation

Conditions

Overwriting default accessors

Attribute query methods

Accessing attributes before they have been typecasted

Dynamic attribute-based finders

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

Single table inheritance

Connection to multiple databases in different models

Exceptions

Constant Summary

::ActiveModel::AttributeMethods - Included

AttributeMethods - Included

Callbacks - Included

::ActiveModel::SecurePassword - Included

Callback Registration

AttributeDecorators - Attributes & Methods

AttributeMethods - Attributes & Methods

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

Store - Attributes & Methods

Timestamp - Attributes & Methods

Locking::Optimistic - Attributes & Methods

Class Attribute Summary

Querying - Extended

ConnectionHandling - Extended

Class Method Summary

Enum - Extended

::ActiveModel::Translation - Included

Querying - Extended

QueryCache::ClassMethods - Extended

ConnectionHandling - Extended

::ActiveSupport::DescendantsTracker - Extended

::ActiveSupport::Benchmarkable - Extended

::ActiveModel::Naming - Extended

Instance Attribute Summary

Serialization - Included

NoTouching - Included

AutosaveAssociation - Included

AttributeMethods::Dirty - self

::ActiveModel::Dirty - Included

AttributeMethods::PrimaryKey - self

AttributeMethods - Included

Validations - Included

::ActiveModel::AttributeAssignment - Included

Persistence - Included

Core - Included

Instance Method Summary

Store - Included

Serialization - Included

::ActiveModel::Serializers::JSON - Included

::ActiveModel::Serialization - Included

Transactions - Included

AutosaveAssociation - Included

AttributeMethods::Dirty - self

::ActiveModel::Dirty - Included

AttributeMethods::PrimaryKey - self

AttributeMethods::Query - self

AttributeMethods::BeforeTypeCast - self

AttributeMethods::Write - self

AttributeMethods::Read - self

AttributeMethods - Included

::ActiveModel::AttributeMethods - Included

Locking::Pessimistic - Included

Validations - Included

::ActiveModel::Validations - Included

Integration - Included

::ActiveModel::Conversion - Included

::ActiveModel::AttributeAssignment - Included

Inheritance - Included

Persistence - Included

`::ActiveModel::AttributeMethods` - Included

`AttributeMethods` - Included

`Callbacks` - Included

`::ActiveModel::SecurePassword` - Included

`AttributeDecorators` - Attributes & Methods

`AttributeMethods` - Attributes & Methods

`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

`Store` - Attributes & Methods

`Timestamp` - Attributes & Methods

`Locking::Optimistic` - Attributes & Methods

`Querying` - Extended

`ConnectionHandling` - Extended

`Enum` - Extended

`::ActiveModel::Translation` - Included

`Querying` - Extended

`QueryCache::ClassMethods` - Extended

`ConnectionHandling` - Extended

`::ActiveSupport::DescendantsTracker` - Extended

`::ActiveSupport::Benchmarkable` - Extended

`::ActiveModel::Naming` - Extended

`Serialization` - Included

`NoTouching` - Included

`AutosaveAssociation` - Included

`AttributeMethods::Dirty` - self

`::ActiveModel::Dirty` - Included

`AttributeMethods::PrimaryKey` - self

`AttributeMethods` - Included

`Validations` - Included

`::ActiveModel::AttributeAssignment` - Included

`Persistence` - Included

`Core` - Included

`Store` - Included

`Serialization` - Included

`::ActiveModel::Serializers::JSON` - Included

`::ActiveModel::Serialization` - Included

`Transactions` - Included

`AutosaveAssociation` - Included

`AttributeMethods::Dirty` - self

`::ActiveModel::Dirty` - Included

`AttributeMethods::PrimaryKey` - self

`AttributeMethods::Query` - self

`AttributeMethods::BeforeTypeCast` - self

`AttributeMethods::Write` - self

`AttributeMethods::Read` - self

`AttributeMethods` - Included

`::ActiveModel::AttributeMethods` - Included

`Locking::Pessimistic` - Included

`Validations` - Included

`::ActiveModel::Validations` - Included

`Integration` - Included

`::ActiveModel::Conversion` - Included

`::ActiveModel::AttributeAssignment` - Included

`Inheritance` - Included

`Persistence` - Included

`Core` - Included

._attr_readonly? ⇒ `Boolean` (rw)

._reflections? ⇒ `Boolean` (rw)

.aggregate_reflections? ⇒ `Boolean` (rw)

.attribute_type_decorations? ⇒ `Boolean` (rw)

.attributes_to_define_after_schema_loads? ⇒ `Boolean` (rw)

.cache_timestamp_format? ⇒ `Boolean` (rw)

.cache_versioning? ⇒ `Boolean` (rw)

.default_connection_handler? ⇒ `Boolean` (rw)

.internal_metadata_table_name? ⇒ `Boolean` (rw)

.lock_optimistically? ⇒ `Boolean` (rw)

.nested_attributes_options? ⇒ `Boolean` (rw)

.pluralize_table_names? ⇒ `Boolean` (rw)

.record_timestamps? ⇒ `Boolean` (rw)

.schema_migrations_table_name? ⇒ `Boolean` (rw)

.store_full_sti_class? ⇒ `Boolean` (rw)

.table_name_prefix? ⇒ `Boolean` (rw)

.table_name_suffix? ⇒ `Boolean` (rw)