Prevent user from being deleted if user has been paid

app/Entities/Users/User.php

@@ -136,4 +136,9 @@ class User extends Authenticatable
             ->groupBy('worker_id')
             ->groupBy('project_id');
     }
+
+    public function payments()
+    {
+        return $this->morphMany('App\Entities\Payments\Payment', 'partner');
+    }
 }

app/Policies/UserPolicy.php

@@ -64,6 +64,8 @@ class UserPolicy
      */
     public function delete(User $user, Worker $worker)
     {
-        return $user->hasRole('admin') && $worker->jobs->isEmpty();
+        return $user->hasRole('admin')
+        && $worker->jobs()->count() == 0
+        && $worker->payments()->count() == 0;
     }
 }

tests/Unit/Models/UserTest.php

@@ -2,6 +2,7 @@
 
 namespace Tests\Unit\Models;
 
+use App\Entities\Payments\Payment;
 use App\Entities\Projects\Job;
 use App\Entities\Projects\Project;
 use App\Entities\Users\User;
@@ -125,4 +126,18 @@ class UserTest extends TestCase
         $this->assertInstanceOf(Project::class, $user->projects->first());
         $this->assertCount(1, $user->projects);
     }
+
+    /** @test */
+    public function a_user_has_many_payments_with_morph_relation()
+    {
+        $user = factory(User::class)->create();
+        $payment = factory(Payment::class)->create([
+            'partner_type' => 'App\Entities\Users\User',
+            'partner_id'   => $user->id,
+        ]);
+
+        $this->assertInstanceOf(Collection::class, $user->payments);
+        $this->assertInstanceOf(Payment::class, $user->payments->first());
+        $this->assertCount(1, $user->payments);
+    }
 }

tests/Unit/Policies/UserPolicyTest.php

@@ -2,6 +2,7 @@
 
 namespace Tests\Unit\Policies;
 
+use App\Entities\Payments\Payment;
 use App\Entities\Projects\Job;
 use App\Entities\Users\User;
 use Illuminate\Foundation\Testing\DatabaseMigrations;
@@ -55,4 +56,17 @@ class UserPolicyTest extends TestCase
 
         $this->assertFalse($admin->can('delete', $user));
     }
+
+    /** @test */
+    public function admin_cannot_delete_a_user_if_user_has_been_paid()
+    {
+        $admin = $this->adminUserSigningIn();
+        $user = factory(User::class)->create();
+        $payment = factory(Payment::class)->create([
+            'partner_type' => 'App\Entities\Users\User',
+            'partner_id'   => $user->id,
+        ]);
+
+        $this->assertFalse($admin->can('delete', $user));
+    }
 }