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										 |  |  | class CoAuthorRelation | 
					
						
							|  |  |  |   include Mongoid::Document | 
					
						
							|  |  |  |   include Mongoid::Timestamps | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  |   field :relation, localize: true | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  |   has_and_belongs_to_many :co_authors | 
					
						
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 | 
					
						
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										 |  |  |   validates :relation, presence: true, | 
					
						
							|  |  |  |             uniqueness: { case_sensitive: false } | 
					
						
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										 |  |  | end |