the model 


					
		
		
validates_confirmation_of :password

				
		

		

	
	





the view 





	
	

		

		

			
				
				

					
		
		
<%= f.password_field :password %>
<%= f.password_field :password_confirmation %>

				
		

		

	
	





a controller 





	
	

		

		

			
				
				

					
		
		
@foo = FooModel.new(params[:foo])
@foo.save # true if they match, false if they don't