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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
private
def define_method_attribute=(name)
safe_name = name.unpack1("h*".freeze)
ActiveModel::AttributeMethods::AttrNames.set_name_cache safe_name, name
generated_attribute_methods.module_eval <<-STR, __FILE__, __LINE__ + 1
def __temp__#{safe_name}=(value)
name = ::ActiveModel::AttributeMethods::AttrNames::ATTR_#{safe_name}
write_attribute(name, value)
end
alias_method #{(name + '=').inspect}, :__temp__#{safe_name}=
undef_method :__temp__#{safe_name}=
STR
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
def attributes
@attributes.to_hash
end
private
def write_attribute(attr_name, value)
name = if self.class.attribute_alias?(attr_name)
self.class.attribute_alias(attr_name).to_s
else
attr_name.to_s
end
@attributes.write_from_user(name, value)
value
end
def attribute(attr_name)
name = if self.class.attribute_alias?(attr_name)
self.class.attribute_alias(attr_name).to_s
else
attr_name.to_s
end
@attributes.fetch_value(name)
end
# Handle *= for method_missing.
def attribute=(attribute_name, value)
write_attribute(attribute_name, value)
end
end
module AttributeMethods #:nodoc:
AttrNames = Module.new {
def self.set_name_cache(name, value)
const_name = "ATTR_#{name}"
unless const_defined? const_name
const_set const_name, -value
end
end
}
end
end
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