Use polymorphic table for mapping resources to tenants (#997)

* wip

* Fix code style (php-cs-fixer)

* adjust tests

* Update ResourceSyncingPolymorphicTest.php

* Update SyncMaster.php

* correct method name

* Update ResourceSyncingPolymorphicTest.php

* use BelongsToMany return type

* separate pivot model for each approach

* ability to publish migrations

* remove unsed import

* use resource migrations from asset

* anonymous migration for `tenant_resources` table

* rename file

* rename classes

* trait

* add back using statement

* revert to unset change

* use unset approach

* use unset approach

* Assert `tenants` are accessible

* Update ResourceSyncingUsingPolymorphicTest.php

* improve `tenants` assertions

* improve assertions

* remove `getResourceTenantModelName` method and use config

* use `BelongsToMany` for `tenants` method return type

* Fix code style (php-cs-fixer)

* revert type

* use correct key

* test right resources are accessible from the tenant

* Update tests/ResourceSyncingUsingPolymorphicTest.php

---------

Co-authored-by: PHP CS Fixer <phpcsfixer@example.com>
Co-authored-by: Samuel Štancl <samuel@archte.ch>

src/Database/Concerns/ResourceSyncing.php

@@ -4,8 +4,10 @@ declare(strict_types=1);
 
 namespace Stancl\Tenancy\Database\Concerns;
 
+use Illuminate\Database\Eloquent\Relations\MorphToMany;
 use Stancl\Tenancy\Contracts\Syncable;
 use Stancl\Tenancy\Contracts\UniqueIdentifierGenerator;
+use Stancl\Tenancy\Database\Models\TenantMorphPivot;
 use Stancl\Tenancy\Events\SyncedResourceSaved;
 
 trait ResourceSyncing
@@ -43,4 +45,10 @@ trait ResourceSyncing
     {
         return true;
     }
+
+    public function tenants(): MorphToMany
+    {
+        return $this->morphToMany(config('tenancy.models.tenant'), 'tenant_resources', 'tenant_resources', 'resource_global_id', 'tenant_id', 'global_id')
+            ->using(TenantMorphPivot::class);
+    }
 }

src/Database/Concerns/TriggerSyncEvent.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Database\Concerns;
+
+use Stancl\Tenancy\Contracts\Syncable;
+
+trait TriggerSyncEvent
+{
+    public static function booted(): void
+    {
+        static::saved(function (self $pivot) {
+            $parent = $pivot->pivotParent;
+
+            if ($parent instanceof Syncable && $parent->shouldSync()) {
+                $parent->triggerSyncEvent();
+            }
+        });
+    }
+}

src/Database/Models/TenantMorphPivot.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy\Database\Models;
+
+use Illuminate\Database\Eloquent\Relations\MorphPivot;
+use Stancl\Tenancy\Database\Concerns\TriggerSyncEvent;
+
+class TenantMorphPivot extends MorphPivot
+{
+    use TriggerSyncEvent;
+}

src/Database/Models/TenantPivot.php

@@ -5,18 +5,9 @@ declare(strict_types=1);
 namespace Stancl\Tenancy\Database\Models;
 
 use Illuminate\Database\Eloquent\Relations\Pivot;
-use Stancl\Tenancy\Contracts\Syncable;
+use Stancl\Tenancy\Database\Concerns\TriggerSyncEvent;
 
 class TenantPivot extends Pivot
 {
-    public static function booted(): void
-    {
-        static::saved(function (self $pivot) {
-            $parent = $pivot->pivotParent;
-
-            if ($parent instanceof Syncable && $parent->shouldSync()) {
-                $parent->triggerSyncEvent();
-            }
-        });
-    }
+    use TriggerSyncEvent;
 }