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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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