Module: ActiveObject::Associations::HasManyAssociation::ClassMethods

Defined in:
lib/active_object/associations.rb

Instance Method Summary collapse

Instance Method Details

#has_many(associations, options = {}) ⇒ Object

选项示例: has_many :friends,:class_name=>“User”



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# File 'lib/active_object/associations.rb', line 171

def has_many(associations, options = {})

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

  define_method("#{associations}_ids") do
    self.instance_variable_get("@#{associations}") ? self.instance_variable_get("@#{associations}").object_ids : []
  end

  define_method("#{associations}_ids=") do |value|
    self.instance_variable_set("@#{associations}",Collection.new)
    value.each do |object_id|
      self.instance_variable_get("@#{associations}").append(self.class.read_inheritable_attribute("#{associations}_class").constantize.find(object_id))
    end
  end

  define_method("#{associations}") do
    self.instance_variable_set("@#{associations}",Collection.new) unless self.instance_variable_get("@#{associations}")
    self.instance_variable_get("@#{associations}")
  end

end