activerecord/test/models/tag.rb


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class Tag < ActiveRecord::Base
  has_many :taggings
  has_many :taggables, :through => :taggings
  has_one  :tagging

  has_many :tagged_posts, :through => :taggings, :source => 'taggable', :source_type => 'Post'
end

class OrderedTag < Tag
  self.table_name = "tags"

  has_many :taggings, -> { order('taggings.id DESC') }, foreign_key: 'tag_id'
end