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GitHub User: LambdaRed

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I'm sure you found you solution by now, but if anyone else is looking around for this:

article.rb
has_many :taggings, :as => :taggable, :dependent => :destroy
has_many :tags, :through => :taggings

And since this is polymorphic these two lines would go into whatever model you wanted to be taggable.

tag.rb
has_many :taggings, :dependent => :destroy
has_many :taggables, :through => :taggings
tagging.rb
belongs_to :taggable, polymorphic: true
belongs_to :tag