$this->otherKey renamed to $this->ownerKey to fix this error: Jenssegers\Mongodb\Relations\BelongsTo::$otherKey

Author: Dariusz Prząda

src/Jenssegers/Mongodb/Relations/BelongsTo.php

@@ -11,7 +11,7 @@ public function addConstraints()
             // For belongs to relationships, which are essentially the inverse of has one
             // or has many relationships, we need to actually query on the primary key
             // of the related models matching on the foreign key that's on a parent.
-            $this->query->where($this->otherKey, '=', $this->parent->{$this->foreignKey});
+            $this->query->where($this->ownerKey, '=', $this->parent->{$this->foreignKey});
         }
     }
 
@@ -25,7 +25,7 @@ public function addEagerConstraints(array $models)
         // We'll grab the primary key name of the related models since it could be set to
         // a non-standard name and not "id". We will then construct the constraint for
         // our eagerly loading query so it returns the proper models from execution.
-        $key = $this->otherKey;
+        $key = $this->ownerKey;
 
         $this->query->whereIn($key, $this->getEagerModelKeys($models));
     }