Module: ActiveModel::API

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In: `::ActionText::Attachables::ContentAttachment`, `::ActionText::AttachmentGallery`, `Model`, `::ActiveRecord::Base`
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, `Validations::HelperMethods`, `Translation`, `Callbacks`, `Naming`, `::ActiveSupport::Concern`
Instance Chain: self, `Conversion`, `Validations::HelperMethods`, `Validations`, `AttributeAssignment`, `ForbiddenAttributesProtection`
Defined in:	activemodel/lib/active_model/api.rb

Overview

Includes the required interface for an object to interact with Action Pack and Action View, using different Active Model modules. It includes model name introspections, conversions, translations, and validations. Besides that, it allows you to initialize the object with a hash of attributes, pretty much like Active Record does.

A minimal implementation could be:

class Person
  include ActiveModel::API
  attr_accessor :name, :age
end

person = Person.new(name: 'bob', age: '18')
person.name # => "bob"
person.age  # => "18"

Note that, by default, API implements #persisted? to return false, which is the most common case. You may want to override it in your class to simulate a different scenario:

class Person
  include ActiveModel::API
  attr_accessor :id, :name

  def persisted?
    self.id.present?
  end
end

person = Person.new(id: 1, name: 'bob')
person.persisted? # => true

Also, if for some reason you need to run code on initialize ( .new ), make sure you call super if you want the attributes hash initialization to happen.

class Person
  include ActiveModel::API
  attr_accessor :id, :name, :omg

  def initialize(attributes={})
    super
    @omg ||= true
  end
end

person = Person.new(id: 1, name: 'bob')
person.omg # => true

For more detailed information on other functionalities available, please refer to the specific modules included in API (see below).

`Validations` - Attributes & Methods

._validators rw
#_validators readonly
._validators? ⇒ Boolean rw
#_validators? ⇒ Boolean readonly

Class Method Summary

`Callbacks` - self

extended

`Naming` - self

param_key	Returns string to use for params names.
plural	Returns the plural class name of a record or class.
route_key	Returns string to use while generating route names.
singular	Returns the singular class name of a record or class.
singular_route_key	Returns string to use while generating route names.
uncountable?	Identifies whether the class name of a record or class is uncountable.
extended, model_name_from_record_or_class

`::ActiveSupport::Concern` - Extended

class_methods	Define class methods from given block.
included	Evaluate given block in context of base class, so that you can write class macros here.
prepended	Evaluate given block in context of base class, so that you can write class macros here.
append_features, prepend_features

Instance Attribute Summary

#persisted? ⇒ Boolean readonly

Indicates if the model is persisted.

`Validations` - Included

#validation_context	Returns the context when running validations.
#validation_context=

`AttributeAssignment` - Included

#attributes=

Alias for AttributeAssignment#assign_attributes.

Instance Method Summary

#initialize(attributes = {})

Initializes a new model with the given params.

`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.

`Validations::HelperMethods` - self

#validates_absence_of	Validates that the specified attributes are blank (as defined by Object#present?).
#validates_acceptance_of	Encapsulates the pattern of wanting to validate the acceptance of a terms of service check box (or similar agreement).
#validates_comparison_of	Validates the value of a specified attribute fulfills all defined comparisons with another value, proc, or attribute.
#validates_confirmation_of	Encapsulates the pattern of wanting to validate a password or email address field with a confirmation.
#validates_exclusion_of	Validates that the value of the specified attribute is not in a particular enumerable object.
#validates_format_of	Validates whether the value of the specified attribute is of the correct form, going by the regular expression provided.
#validates_inclusion_of	Validates whether the value of the specified attribute is available in a particular enumerable object.
#validates_length_of	Validates that the specified attributes match the length restrictions supplied.
#validates_numericality_of	Validates whether the value of the specified attribute is numeric by trying to convert it to a float with `Kernel.Float` (if `only_integer` is `false`) or applying it to the regular expression `/\A[+\-]?\d+\z/` (if `only_integer` is set to `true`).
#validates_presence_of	Validates that the specified attributes are not blank (as defined by Object#blank?).
#validates_size_of	Alias for Validations::HelperMethods#validates_length_of.
#_merge_attributes

`Validations` - Included

#errors	Returns the `Errors` object that holds all information about attribute error messages.
#freeze,
#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 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.
#context_for_validation, #init_internals, #raise_validation_error, #run_validations!,
#initialize_dup	Clean the `Errors` object if instance is duped.

`AttributeAssignment` - Included

#assign_attributes	Allows you to set all the attributes by passing in a hash of attributes with keys matching the attribute names.
#attribute_writer_missing	Like `BasicObject#method_missing`, `#attribute_writer_missing` is invoked when `#assign_attributes` is passed an unknown attribute name.
#_assign_attribute, #_assign_attributes

`ForbiddenAttributesProtection` - Included

#sanitize_for_mass_assignment,
#sanitize_forbidden_attributes	Alias for ForbiddenAttributesProtection#sanitize_for_mass_assignment.

DSL Calls

included

[ GitHub ]

# File 'activemodel/lib/active_model/api.rb', line 65


included do
  extend ActiveModel::Naming
  extend ActiveModel::Translation
end

Class Attribute Details

._validators (rw)

[ GitHub ]

# File 'activemodel/lib/active_model/validations.rb', line 50


class_attribute :_validators, instance_writer: false, default: Hash.new { |h, k| h[k] = [] }

._validators? ⇒ `Boolean` (rw)

[ GitHub ]

# File 'activemodel/lib/active_model/validations.rb', line 50


class_attribute :_validators, instance_writer: false, default: Hash.new { |h, k| h[k] = [] }

.param_delimiter (rw)

[ GitHub ]

# File 'activemodel/lib/active_model/conversion.rb', line 32


class_attribute :param_delimiter, instance_reader: false, default: "-"

.param_delimiter? ⇒ `Boolean` (rw)

[ GitHub ]

# File 'activemodel/lib/active_model/conversion.rb', line 32


class_attribute :param_delimiter, instance_reader: false, default: "-"

Instance Attribute Details

#_validators (readonly)

[ GitHub ]

# File 'activemodel/lib/active_model/validations.rb', line 50


class_attribute :_validators, instance_writer: false, default: Hash.new { |h, k| h[k] = [] }

#_validators? ⇒ `Boolean` (readonly)

[ GitHub ]

# File 'activemodel/lib/active_model/validations.rb', line 50


class_attribute :_validators, instance_writer: false, default: Hash.new { |h, k| h[k] = [] }

#persisted? ⇒ `Boolean` (readonly)

Indicates if the model is persisted. Default is false.

class Person
  include ActiveModel::API
  attr_accessor :id, :name
end

person = Person.new(id: 1, name: 'bob')
person.persisted? # => false

[ GitHub ]

# File 'activemodel/lib/active_model/api.rb', line 95


def persisted?
  false
end

Instance Method Details

#initialize(attributes = {})

Initializes a new model with the given params.

class Person
  include ActiveModel::API
  attr_accessor :name, :age
end

person = Person.new(name: 'bob', age: '18')
person.name # => "bob"
person.age  # => "18"

[ GitHub ]

# File 'activemodel/lib/active_model/api.rb', line 80


def initialize(attributes = {})
  assign_attributes(attributes) if attributes

  super()
end

Module: ActiveModel::API

Overview

Conversion - Attributes & Methods

Validations - Attributes & Methods

Class Method Summary

Callbacks - self

Naming - self

::ActiveSupport::Concern - Extended

Instance Attribute Summary

Validations - Included

AttributeAssignment - Included

Instance Method Summary

Conversion - Included

Validations::HelperMethods - self

Validations - Included

AttributeAssignment - Included

ForbiddenAttributesProtection - Included

DSL Calls

included

Class Attribute Details

._validators (rw)

._validators? ⇒ Boolean (rw)

.param_delimiter (rw)

.param_delimiter? ⇒ Boolean (rw)

Instance Attribute Details

#_validators (readonly)

#_validators? ⇒ Boolean (readonly)

#persisted? ⇒ Boolean (readonly)

Instance Method Details

#initialize(attributes = {})

`Conversion` - Attributes & Methods

`Validations` - Attributes & Methods

`Callbacks` - self

`Naming` - self

`::ActiveSupport::Concern` - Extended

`Validations` - Included

`AttributeAssignment` - Included

`Conversion` - Included

`Validations::HelperMethods` - self

`Validations` - Included

`AttributeAssignment` - Included

`ForbiddenAttributesProtection` - Included

._validators? ⇒ `Boolean` (rw)

.param_delimiter? ⇒ `Boolean` (rw)

#_validators? ⇒ `Boolean` (readonly)

#persisted? ⇒ `Boolean` (readonly)