Handle parent deletion in associated tables (MainBundle)

src/Bundle/ChillMainBundle/Entity/Address.php

@@ -137,7 +137,7 @@ class Address
      * @var ThirdParty|null
      *
      * @ORM\ManyToOne(targetEntity="Chill\ThirdPartyBundle\Entity\ThirdParty")
-     * @ORM\JoinColumn(nullable=true)
+     * @ORM\JoinColumn(nullable=true, onDelete="SET NULL")
      */
     private $linkedToThirdParty;
 

src/Bundle/ChillMainBundle/migrations/Version20210525144016.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Chill\Migrations\Main;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Specify ON DELETE behaviour to handle deletion of parents in associated tables
+ */
+final class Version20210525144016 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Specify ON DELETE behaviour to handle deletion of parents in associated tables';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE chill_main_address DROP CONSTRAINT FK_165051F6114B8DD9');
+        $this->addSql('ALTER TABLE chill_main_address ADD CONSTRAINT FK_165051F6114B8DD9 FOREIGN KEY (linkedToThirdParty_id) REFERENCES chill_3party.third_party (id) ON DELETE SET NULL NOT DEFERRABLE INITIALLY IMMEDIATE');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE chill_main_address DROP CONSTRAINT fk_165051f6114b8dd9');
+        $this->addSql('ALTER TABLE chill_main_address ADD CONSTRAINT fk_165051f6114b8dd9 FOREIGN KEY (linkedtothirdparty_id) REFERENCES chill_3party.third_party (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
+    }
+}