fixup! discount percentage for specific customer is implemented

src/Shopsys/ShopBundle/Form/Admin/CustomerFormTypeExtension.php

@@ -28,6 +28,9 @@ public function buildForm(FormBuilderInterface $builder, array $options)
 
         $builderSystemDataGroup->add('discount', IntegerType::class, [
             'constraints' => [
+                new Constraints\NotBlank([
+                    'message' => 'Please enter discount percentage',
+                ]),
                 new Constraints\Range([
                     'min' => 0,
                     'max' => 100,
@@ -37,7 +40,6 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 ]),
             ],
             'label' => t('Discount'),
-            'required' => false,
         ]);
 
         if ($options['user'] !== null) {

src/Shopsys/ShopBundle/Migrations/Version20190108205209.php

@@ -12,7 +12,7 @@ class Version20190108205209 extends AbstractMigration
      */
     public function up(Schema $schema)
     {
-        $this->sql('ALTER TABLE users ADD discount INT DEFAULT NULL');
+        $this->sql('ALTER TABLE users ADD discount INT DEFAULT 0 NOT NULL');
     }
 
     /**

src/Shopsys/ShopBundle/Model/Customer/User.php

@@ -31,7 +31,7 @@ class User extends BaseUser
 
     /**
      * @var int|null
-     * @ORM\Column(type="integer", nullable=true)
+     * @ORM\Column(type="integer", options={"default" : 0})
      */
     protected $discount;