Fix push on model instances

src/Jenssegers/Mongodb/Model.php

@@ -205,6 +205,23 @@ abstract class Model extends \Jenssegers\Eloquent\Model {
         return $query = $this->newQuery()->where($this->getKeyName(), $this->getKey())->unset($columns);
     }
 
+    /**
+     * Pass push to the query builder.
+     *
+     * @return mixed
+     */
+    public function push()
+    {
+        if ($parameters = func_get_args())
+        {
+            $query = $this->newQuery();
+
+            return call_user_func_array(array($query, 'push'), $parameters);
+        }
+
+        return parent::push();
+    }
+
     /**
      * Create a new Eloquent query builder for the model.
      *