Parse.com查询iOS上不为空的列

Question

This should be a simple task but it's causing me grief. I have objects that look like this in the database:

{
  "objectId": "abcdefg1",
  "comment": null
},
{
  "objectId": "abcdefg2",
  "comment": "Some text as a comment"
}

I'm trying to query for only records that have comment text on iOS. I'm executing the following query:

PFQuery *query = [PFQuery queryWithClassName:@"Review"];
[query whereKeyExists:@"comment"];

When it's executed I'm getting the two results listed above when I'm expecting only one. Can someone please point out where I'm going wrong. Thanks!

Answer 1

Ugh...naturally I just figured it out. Here is the solution:

PFQuery *query = [PFQuery queryWithClassName:@"Review"];
[query whereKey:@"comment" notEqualTo:[NSNull null]];

This returns me the one object I expected. I need to pay attention to the documentation better.

https://parse.com/docs/ios/guide#objects-data-types