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							class Tagging
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							  include Mongoid::Document
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							  include Mongoid::Timestamps
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							  field :to_destroy, default: false
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							  belongs_to :tag
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							  belongs_to :taggable, polymorphic: true
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							  before_destroy :update_taggable_tag_ids
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							  private
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							  def update_taggable_tag_ids
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							    self.taggable.remove_id(self.tag.id)
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							  end
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							end |