从以下位置获取关联列表：accepts_nested_attributes_for

Question

I want to get a list of the associations that a model :accepts_nested_attributes_for . For instance, I'd like to get [:children, :other_children] from this model:

class ParentResource < ActiveRecord::Base
  has_many :children
  has_many :other_children
  has_many :non_nested_children

  accepts_nested_attributes_for :children, :other_children
end

Right now, I'm doing this with the following function:

def self.nested_associations
  reflect_on_all_associations.map(&:name).select do |association_name|
    association_name if method_defined?("#{association_name}_attributes=".to_sym)
  end
end

I get the feeling that there's a baked-in way to get this array, however. If so, what's the proper method.

Answer 1

我不确定这是'正确的方法'，但你不能这样做：

ParentResource.nested_attributes_options.keys