Create a job in Parse which delete all old objects in all Classes

Question

I have created a chat app in IOS with Parse.com. I want after 30min to delete all old messages. Every chatroom is a class in parse which contains the messages between two users.

Can you help me to create a repeatly job in parse that search for old messages in all classes and deletes them ?

Answer 1

To avoid exceeding the request limit, maybe you should delete the objects in every single minute. You can find out all the objects and delete them by something like this.

var time = new Date(new Date() - 30*60*1000);        // 30min ago
var query = new Parse.Query('ChatLog');
query.lessThan('createdAt', time);
query.limit(1000);
query.find().then(function(results) {
    return Parse.Object.destroyAll(results);
});

Answer 2

The answer from @iForests is good. There is likely a way to do this same thing with .each() which won't have any query limits. Maybe something like:

var thirtyMinutes = 30*60*1000
var now = new Date()
var thirtyMinutesAgo = new Date(now-thirtyMinutes)

var query = new Parse.Query('ChatLog')
query.lessThan('createdAt', thirtyMinutesAgo)

var objectsToDelete = []

query.each(function(object){
  objectsToDelete.push(object)
}).then(function(){
  var howManyDeleted = objectsToDelete.length
  Parse.Object.destroyAll(objectsToDelete)
  status.success(howManyDeleted+' chat logs deleted.')
}, function(error){
  status.error('Error during background job.')
})

Forgive my lack of semi-colons--I'm a Swift person :) Good luck!