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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
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