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                            有時候訂購行為會跟「數量」有關。例如，你的應用程序可能會依照帳號的用戶人數，每人每月收取 $10 元。你可以使用 increment 和 decrement 方法簡單的調整訂購數量：

~~~
$user = User::find(1);

$user->subscription()->increment();

// Add five to the subscription's current quantity...
$user->subscription()->increment(5);

$user->subscription()->decrement();

// Subtract five to the subscription's current quantity...
$user->subscription()->decrement(5);
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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