如何计算parse.com查询中数组值的数量？

Question

PFQuery *query1 = [PFUser query];
[query1 whereKey:@"array" containedIn:currentUserArray];

PFQuery *orderQuery = [PFQuery orQueryWithSubqueries:@[query1]];
[orderQuery orderByAscending:query1.count];

I know this code won't do the trick , but this is all I have so far.

Basically I'm doing a query on User class to see if any User's " array " is containedIn currentUser's array .

As of right now, I can get all the users that have common array values, but I want to order the results from most common arrays to least common .

I know you can countObjects in query, but I'm trying to count array values in objects in query.

How can I do this? Will I have to go beyond Parse's documentation to accomplish this?

Answer 1

The answer is that you will need to store and maintain a count field. You can use Cloud Code to keep the number updated.

Read the help documentation on Cloud Code - Performing Actions After a Save , as it covers maintaining a count like you would need to.

Once you have that in place you will have a field you can sort on.