16 lines
		
	
	
		
			314 B
		
	
	
	
		
			Ruby
		
	
	
	
		
		
			
		
	
	
			16 lines
		
	
	
		
			314 B
		
	
	
	
		
			Ruby
		
	
	
	
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								class BufferCategory
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								  include Mongoid::Document
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								  include Mongoid::Timestamps
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								  belongs_to :category
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								  belongs_to :categorizable, polymorphic: true
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								  before_destroy :remove_categorizable_category_id
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								  private
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								  def remove_categorizable_category_id
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								    self.categorizable.remove_id(self.category.id)
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								  end
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								end
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