Parse, how to send push notification to targeted users - push-notification

Question

I have successfully setup parse push notifications and in my installation table I have both an installation, and device token. What I'm really trying to do is send a push notification to certain users, rather than certain devices. How do I bing the installations table to the uses table, so that I can make a query by users and get back a deviceid to push to

Answer 1

From https://parse.com/docs/push_guide#top/iOS, section "Using Advanced Targeting".
You can even create relationships between your Installation objects
and other classes saved on Parse. To associate a PFInstallation with a
particular user, for example, you can simply store the current user on
the PFInstallation.
// Associate the device with a user
PFInstallation *installation = [PFInstallation currentInstallation];
installation[#"user"] = [PFUser currentUser];
[installation saveInBackground];
Now you can create a query on the installation table, where "user" is the user you want to send a push notification to.
Finally, use that query when constructing the push object.
Example in Objective-C (adjust accordingly, if you're sending the push in some other language):
PFQuery *pushQuery = [PFInstallation query];
[pushQuery whereKey:#"user" equalTo:someUser]; // where some user is the user object that is to receive a push notification
PFPush *push = [[PFPush alloc] init];
[push setQuery:pushQuery];
[push setMessage:#"Hi there!"];
[push sendPushInBackground];