Parse.com嵌套查詢包含doesNotMatchQuery

Question

我有User和GroupMember類與解析。

我在GroupMember類一個加入User指針列和想從User類獲取所有用戶，但不包括其存在於GroupMember類關係。

Answer 1

您必須進行兩個查詢，其中您從GroupMember的指針列中查詢所有用戶objectId，然後從User類的下一個查詢中排除這些對象。

ParseQuery<ParseObject> a = ParseQuery.getQuery("GroupMember"); 
a.include("name of pointer column") 
a.findInBackground(new FindCallback...); // get list of objects id with for each loop 
//i.e. for (ParseObject o : list) String s = o.getParseObject("user_pointer_column").getObjectId(); 
//then add it to some list 

ParseQuery<ParseObject> b = ParseQuery.getQuery("User"); 
b.whereNotContainedIn("objectId", list_of_ids); 

或者其他方式：

ParseQuery<ParseObject> a = ParseQuery.getQuery("User"); 
ParseQuery<ParseObject> b = ParseQuery.getQuery("GroupMember"); 
b.whereDoesNotMatchQuery("user_pointer_column", a); 
b.findInBackground(new FindCallback...{...});