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# frozen_string_literal: true
require "active_model/attribute_set"
require "active_model/attribute/user_provided_default"
module ActiveModel
module Attributes #:nodoc:
extend ActiveSupport::Concern
include ActiveModel::AttributeMethods
included do
attribute_method_suffix "="
class_attribute :attribute_types, :_default_attributes, instance_accessor: false
self.attribute_types = Hash.new(Type.default_value)
self._default_attributes = AttributeSet.new({})
end
module ClassMethods
def attribute(name, type = Type::Value.new, **options)
name = name.to_s
if type.is_a?(Symbol)
type = ActiveModel::Type.lookup(type, **options.except(:default))
end
self.attribute_types = attribute_types.merge(name => type)
define_default_attribute(name, options.fetch(:default, NO_DEFAULT_PROVIDED), type)
define_attribute_method(name)
end
# Returns an array of attribute names as strings
#
# class Person
# include ActiveModel::Attributes
#
# attribute :name, :string
# attribute :age, :integer
# end
#
# Person.attribute_names
# # => ["name", "age"]
def attribute_names
attribute_types.keys
end
private
def define_method_attribute=(name)
ActiveModel::AttributeMethods::AttrNames.define_attribute_accessor_method(
generated_attribute_methods, name, writer: true,
) do |temp_method_name, attr_name_expr|
generated_attribute_methods.module_eval <<-RUBY, __FILE__, __LINE__ + 1
def #{temp_method_name}(value)
name = #{attr_name_expr}
write_attribute(name, value)
end
RUBY
end
end
NO_DEFAULT_PROVIDED = Object.new # :nodoc:
private_constant :NO_DEFAULT_PROVIDED
def define_default_attribute(name, value, type)
self._default_attributes = _default_attributes.deep_dup
if value == NO_DEFAULT_PROVIDED
default_attribute = _default_attributes[name].with_type(type)
else
default_attribute = Attribute::UserProvidedDefault.new(
name,
value,
type,
_default_attributes.fetch(name.to_s) { nil },
)
end
_default_attributes[name] = default_attribute
end
end
def initialize(*)
@attributes = self.class._default_attributes.deep_dup
super
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::Model
# include ActiveModel::Attributes
#
# attribute :name, :string
# attribute :age, :integer
# end
#
# person = Person.new(name: 'Francesco', age: 22)
# person.attributes
# # => {"name"=>"Francesco", "age"=>22}
def attributes
@attributes.to_hash
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"]
def attribute_names
@attributes.keys
end
private
def write_attribute(attr_name, value)
name = attr_name.to_s
name = self.class.attribute_aliases[name] || name
@attributes.write_from_user(name, value)
value
end
def attribute(attr_name)
name = attr_name.to_s
name = self.class.attribute_aliases[name] || name
@attributes.fetch_value(name)
end
# Dispatch target for <tt>*=</tt> attribute methods.
def attribute=(attribute_name, value)
write_attribute(attribute_name, value)
end
end
end
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