[4.x] Don't use onDeleteCascade in the migrations (#883)

* removed `cascade` on delete for domains

* removed only `onDelete` cascade

* keep impersonation migrations unchanged

* domains set null on delete

* Update 2019_09_15_000020_create_domains_table.php

* Added DeleteDomain Job while deleting tenant.

* Update assets/TenancyServiceProvider.stub.php

Co-authored-by: Samuel Štancl <samuel@archte.ch>

* renamed class

* Update DeleteDomains.php

* onDelete restrict

* revert nullable

* removed `shouldQueue` interface

* Update TenancyServiceProvider.stub.php

* fetch and delete domains individually

* Update DeleteDomains.php

* tests for `DeleteDomains` job

Co-authored-by: Samuel Štancl <samuel@archte.ch>

assets/TenancyServiceProvider.stub.php

@@ -40,7 +40,13 @@ class TenancyServiceProvider extends ServiceProvider
             Events\TenantSaved::class => [],
             Events\UpdatingTenant::class => [],
             Events\TenantUpdated::class => [],
-            Events\DeletingTenant::class => [],
+            Events\DeletingTenant::class => [
+                JobPipeline::make([
+                    Jobs\DeleteDomains::class,
+                ])->send(function (Events\DeletingTenant $event) {
+                    return $event->tenant;
+                })->shouldBeQueued(false),
+            ],
             Events\TenantDeleted::class => [
                 JobPipeline::make([
                     Jobs\DeleteDatabase::class,

assets/migrations/2019_09_15_000020_create_domains_table.php

@@ -21,7 +21,7 @@ class CreateDomainsTable extends Migration
             $table->string('tenant_id');
 
             $table->timestamps();
-            $table->foreign('tenant_id')->references('id')->on('tenants')->onUpdate('cascade')->onDelete('cascade');
+            $table->foreign('tenant_id')->references('id')->on('tenants')->onUpdate('cascade');
         });
     }
 

src/Jobs/DeleteDomains.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Jobs;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+use Stancl\Tenancy\Contracts\TenantWithDatabase;
+use Stancl\Tenancy\Database\Models\Domain;
+use Stancl\Tenancy\Events\DatabaseDeleted;
+use Stancl\Tenancy\Events\DeletingDatabase;
+use Stancl\Tenancy\Events\DeletingDomain;
+use Stancl\Tenancy\Events\DomainDeleted;
+
+class DeleteDomains
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    /** @var TenantWithDatabase */
+    protected $tenant;
+
+    public function __construct(TenantWithDatabase $tenant)
+    {
+        $this->tenant = $tenant;
+    }
+
+    public function handle()
+    {
+        $this->tenant->domains->each->delete();
+    }
+}

tests/DeleteDomainsJobTest.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Tests;
+
+use Stancl\Tenancy\Database\Concerns\HasDomains;
+use Stancl\Tenancy\Jobs\DeleteDomains;
+
+class DeleteDomainsJobTest extends TestCase
+{
+    public function setUp(): void
+    {
+        parent::setUp();
+
+        config(['tenancy.tenant_model' => DatabaseAndDomainTenant::class]);
+    }
+
+    /** @test */
+    public function job_delete_domains_successfully()
+    {
+        $tenant = DatabaseAndDomainTenant::create();
+
+        $tenant->domains()->create([
+            'domain' => 'foo.localhost',
+        ]);
+        $tenant->domains()->create([
+            'domain' => 'bar.localhost',
+        ]);
+
+        $this->assertSame($tenant->domains()->count(), 2);
+
+        (new DeleteDomains($tenant))->handle();
+
+        $this->assertSame($tenant->refresh()->domains()->count(), 0);
+    }
+}
+
+class DatabaseAndDomainTenant extends Etc\Tenant
+{
+    use HasDomains;
+}