Module: ActiveObject::Associations::HasOneAssociation::ClassMethods

Defined in:
lib/active_object/associations.rb

Instance Method Summary collapse

Instance Method Details

#has_one(association, options = {}) ⇒ Object

选项示例: has_one :icon,:class_name=>“Photo”



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# File 'lib/active_object/associations.rb', line 48

def has_one(association, options = {})

	class_name = options.delete(:class_name) || association.to_s.camelize
	write_inheritable_attribute "#{association}_class",class_name   # 保存关联的类名
	attr_accessor "#{association}"
	merge_attributes "#{association}_id"                            # 将关联id作为持久化属性

	define_method("#{association}_id") do
		self.instance_variable_get("@#{association}") ? self.instance_variable_get("@#{association}").id : nil
	end

	define_method("#{association}_id=") do |value|
		self.instance_variable_set("@#{association}",self.class.read_inheritable_attribute("#{association}_class").constantize.find(value))
	end
end