module ActiveModel::Attributes

Included modules:: ActiveModel::AttributeMethods

Active Model Attributes

The Attributes module allows models to define attributes beyond simple Ruby readers and writers. Similar to Active Record attributes, which are typically inferred from the database schema, Active Model Attributes are aware of data types, can have default values, and can handle casting and serialization.

To use Attributes, include the module in your model class and define your attributes using the attribute macro. It accepts a name, a type, a default value, and any other options supported by the attribute type.

Examples

class Person
  include ActiveModel::Attributes

  attribute :name, :string
  attribute :active, :boolean, default: true
end

person = Person.new
person.name = "Volmer"

person.name # => "Volmer"
person.active # => true

Public Instance Methods

attribute_names() Show source

# File activemodel/lib/active_model/attributes.rb, line 146
def attribute_names
  @attributes.keys
end

Returns an array of attribute names as strings.

class Person
  include ActiveModel::Attributes

  attribute :name, :string
  attribute :age, :integer
end

person = Person.new
person.attribute_names # => ["name", "age"]

attributes() Show source

# File activemodel/lib/active_model/attributes.rb, line 131
def attributes
  @attributes.to_hash
end

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

class Person
  include ActiveModel::Attributes

  attribute :name, :string
  attribute :age, :integer
end

person = Person.new
person.name = "Francesco"
person.age = 22

person.attributes # => { "name" => "Francesco", "age" => 22}