6 lines
		
	
	
		
			115 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
			
		
		
	
	
			6 lines
		
	
	
		
			115 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
| class User < ActiveRecord::Base
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|   belongs_to :account, inverse_of: :user
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| 
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|   validates :account, presence: true
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| end
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