6 lines
		
	
	
		
			123 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
			
		
		
	
	
			6 lines
		
	
	
		
			123 B
		
	
	
	
		
			Ruby
		
	
	
	
	
	
| class AddIndexToClients < ActiveRecord::Migration[8.0]
 | |
|   def change
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|     add_index :clients, :email, unique: true
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|   end
 | |
| end
 | 
