5.1 - Persisting the Order Amount

app/Concert.php

@@ -58,7 +58,10 @@ class Concert extends Model
             throw new NotEnoughTicketsException;
         }
 
-        $order = $this->orders()->create(['email' => $email]);
+        $order = $this->orders()->create([
+            'email' => $email,
+            'amount' => $ticketQuantity * $this->ticket_price,
+        ]);
 
         foreach ($tickets as $ticket) {
             $order->tickets()->save($ticket);

app/Order.php

@@ -37,7 +37,7 @@ class Order extends Model
         return [
             'email' => $this->email,
             'ticket_quantity' => $this->ticketQuantity(),
-            'amount' => $this->ticketQuantity() * $this->concert->ticket_price,
+            'amount' => $this->amount,
         ];
     }
 }

database/migrations/2016_11_08_205823_create_orders_table.php

@@ -16,6 +16,7 @@ class CreateOrdersTable extends Migration
         Schema::create('orders', function (Blueprint $table) {
             $table->increments('id');
             $table->unsignedInteger('concert_id');
+            $table->integer('amount');
             $table->string('email');
             $table->timestamps();
         });