Merge pull request #604 from atomic-labs/master

addressing #603

lib/relation-definition.js

@@ -869,7 +869,7 @@ HasMany.prototype.destroyById = function (fkId, options, cb) {
     if (err) {
       return cb(err);
     }
-    self.removeFromCache(inst[fkId]);
+    self.removeFromCache(fkId);
     inst.destroy(options, cb);
   });
   return cb.promise;