method

through_reflection

through_reflection()
public

Returns the AssociationReflection object specified in the :through option of a HasManyThrough or HasOneThrough association.

class Post < ActiveRecord::Base
  has_many :taggings
  has_many :tags, :through => :taggings
end

tags_reflection = Post.reflect_on_association(:tags)
taggings_reflection = tags_reflection.through_reflection