Merge pull request #21 from GrahamCampbell/patch-1

Use parent performJoin

src/Relations/BelongsToManySoft.php

@@ -122,19 +122,12 @@ protected function performJoin($query = null)
     {
         $query = $query ?: $this->query;
 
-        // We need to join to the intermediate table on the related model's primary
-        // key column with the intermediate table's foreign key for the related
-        // model instance. Then we can set the "where" for the parent models.
-        $baseTable = $this->related->getTable();
-
-        $key = $baseTable.'.'.$this->relatedKey;
-
-        $query->join($this->table, $key, '=', $this->getQualifiedRelatedPivotKeyName());
+        parent::performJoin($query);
 
         $query->when($this->withSoftDeletes, function (Builder $query) {
             $query->whereNull($this->getQualifiedDeletedAtColumnName());
         });
 
         return $this;
     }
-}
+}