Possible Parse bug in matchesKeyInQuery - parse-platform

Question

If a post in my Parse database is liked, I want to send a push to the author via cloud code.
To be able to send pushes to specific users, all installations store the objectId of the current user. To find the author of the liked post, I use the query
var userWhosePostWasLikedQuery = new Parse.Query(Parse.Installation);
userWhosePostWasLikedQuery.equalTo(kClassInstallationKeyCurrentUserId, userWhosePostWasLiked.id);
This works fine: A single push is sent to the author.
Now I want to send this push only if the author has such pushes enabled. Thus each user stores a push settings array with enable flags for different pushes.
I use now another query for all users who have such pushes enabled:
const User = Parse.Object.extend(kClassUser);
var pushEnabledUserQuery = new Parse.Query(User);
pushEnabledUserQuery.equalTo(kClassUserKeyPushSettings, kPushNotificationTypePostLiked);
This query correctly returns all users who have such pushes enabled.
Eventually, I want to constrain the query for installations with the author as current user, by this query for users who have pushes enabled. This is done in the following way:
var userWhosePostWasLikedQuery = new Parse.Query(Parse.Installation);
userWhosePostWasLikedQuery.equalTo(kClassInstallationKeyCurrentUserId, userWhosePostWasLiked.id);
userWhosePostWasLikedQuery.matchesKeyInQuery(kClassInstallationKeyCurrentUserId, kPFObjectId, pushEnabledUserQuery);
Since the old query without the 3rd line returns 1 user, the new query with the additional constraint (matchesKeyInQuery) should return the same user, since the author has pushes enabled.
But it returns 2 users, the author and another user who liked the post.
To my understanding, this looks like a Parse bug, since all constraints to a query are ANDed.
Any ideas, maybe for a workaround?

Answer 1

your var "kPFObjectId" should be change to "user".
the default parse Installation come with the pointer named "user" and not "kPFObjectId".
I can tell you that Im using the same method ("matchesKeyInQuery") and it is working well:
Parse.Cloud.define("sendPushForChat", function(request, response) {
var userId = request.params.userId;
var groupId = request.params.groupId;
var query = new Parse.Query('RecentActivity');
query.equalTo('groupId',groupId);
query.include('user');
query.notEqualTo('user', {__type: "Pointer", className: "_User", objectId: userId});
var queryInstallation = new Parse.Query(Parse.Installation);
queryInstallation.matchesKeyInQuery('user', 'user', query);
var message = request.params.messageContent;
Parse.Push.send({
where: queryInstallation,
data: {
alert: message,
badge: "Increment",
title: "מה נשמע?"
}
}, {
success: function() {
console.log("Push for chat was successful");
response.success('Push for chat was successful');
},
error: function(error) {
console.error(error);
response.error('error');
},
useMasterKey:true,
});
})