[SOLVED] Query Parse Relation with Object ID Only

Query Parse Relation with Object ID Only

I want to conduct a Parse query on a class that has a relation column. From what I understand, I can't pass the entire relation object with a cloud function, I can only pass the objectId as a string.

So in my iOS app, I pass the objectId like this:

PFCloud.callFunctionInBackground("customReport", withParameters: ["thing":thing.objectId]){ (response, error) -> Void in
  println(response)
}

Then in my Cloud code function:

Parse.Cloud.define("customReport", function(request, response) {
  var promises = []

  var query = new Parse.Query("MyClass")

  //Search for thing
  if(request.params.thing != ""){
    query.equalTo('thing',request.params.thing)

    var promise1 = query.find()

    promises.push(promise1) 
  }

  //...

})

But this doesn't work because the equalTo statement expects a thing object, not an objectId.

Is there a way I can query a relation with just the objectId? Or do I have to query for the thing object using the objectId and then do the equalTo check?

Solution

It looks like you can query by objectId after all. You just need to create an empty object with the ID first like this:

//In my Cloud Code function...    
var ThingObject = Parse.Object.extend("Thing")
var temporaryThing = new ThingObject()

temporaryThing.id = request.params.thing
query.equalTo('thing',temporaryThing)