Add config option for model owner key

src/Notifynder/Collections/Config.php

@@ -61,6 +61,14 @@ public function getNotifiedModel()
         throw new InvalidArgumentException("The model class [{$class}] doesn't exist.");
     }
 
+    /**
+     * @return string
+     */
+    public function getNotifiedModelOwnerKey()
+    {
+        return (string) $this->get('model_owner_key', 'id');
+    }
+
     /**
      * @return array
      */

src/Notifynder/Contracts/ConfigContract.php

@@ -27,6 +27,11 @@ public function isTranslated();
      */
     public function getNotifiedModel();
 
+    /**
+     * @return string
+     */
+    public function getNotifiedModelOwnerKey();
+
     /**
      * @return array
      */

src/Notifynder/Models/Notification.php

@@ -91,7 +91,7 @@ public function from()
             return $this->morphTo('from');
         }
 
-        return $this->belongsTo(notifynder_config()->getNotifiedModel(), 'from_id');
+        return $this->belongsTo(notifynder_config()->getNotifiedModel(), 'from_id', notifynder_config()->getNotifiedModelOwnerKey());
     }
 
     /**
@@ -103,7 +103,7 @@ public function to()
             return $this->morphTo('to');
         }
 
-        return $this->belongsTo(notifynder_config()->getNotifiedModel(), 'to_id');
+        return $this->belongsTo(notifynder_config()->getNotifiedModel(), 'to_id', notifynder_config()->getNotifiedModelOwnerKey());
     }
 
     /**

src/config/notifynder.php

@@ -15,6 +15,13 @@
      */
     'model' => 'App\User',
 
+    /*
+     * If your model is not using id as it's primary key
+     * please specific it here, this option is not
+     * considerate if using notifynder as polymorphic
+     */
+    'model_owner_key' => 'id',
+
     /*
      * Do you want have notifynder that work polymorphically?
      * just swap the value to true and you will able to use it!