我是否必须先获取对象才能更新parse.com中的元数据字段

Question

In Parse.com, the help document for updating an object seems to require a query first to retrieve the object before one can update the meta data.

Given that I know the objectId of the object I am updating, do I still have to make this additional call to retrieve everything else about the object before I can send an update call (via saveInBackground)?

Answer 1

Yes, you do. In order to update an object from parse, you must have a local copy.

In order to make a call to update an object - which can take several forms of save or saveInBackground or saveEventually , etc. - you must first make a query to have a copy of the object.

If you know the objectId, is sounds like you have already run a query on an associated object - why not get the full object then with an includeKey: call? https://www.parse.com/docs/ios_guide#queries-relational/iOS