How to return an object from a Parse query?

Question

This is how I'm doing it:

  const Document = Parse.Object.extend('Document')
  const query = new Parse.Query(Document)
  let result = {}
  query.get(id, {
    success: function (object) {
      result = object.toJSON()
      console.log(result)
    },
    error: function (object, error) {
      alert(`Error: ${error.code} ${error.message}`)
    }
  })
  console.log(result)
  return result

The first console.log(result) outputs the object:

Object {content: "trstrtrts", createdAt: "2016-01-17T11:20:30.694Z", title: "Document 2", updatedAt: "2016-01-17T11:20:30.694Z", wordCount: "3000"…}

But the second one returns nothing. What's the correct way of returning an object from a Parse query?

EDIT:

Based on Anon's answer I tried this:

store.js:

store.first = (id) => {
  var query = new Parse.Query(Document)
  return query.get(id)
}

export default store

main.js:

store.first(to.params.id).then((document) => {
   console.log(document.toJSON())
   return document.toJSON()
 })

But I get the following error:

Uncaught TypeError: Object function ParsePromise() { _classCallCheck(this, ParsePromise); this._resolved = false; this._rejected = false; this._resolvedCallbacks = []; this._rejectedCallbacks = []; } has no method 'all'

Alon · Accepted Answer · 2016-01-17 13:06:16Z

1

The second

 console.log(result)

take place before the first one.Query is an async operation. The correct way of doing this is to use promises. For example you can do

function foo(id){
     var Document = Parse.Object.extend('Document');
     var query = new Parse.Query(Document);
      return query.get(id);
}

and then use the function foo like this:

foo(objectID).then(function(object){
  //do something with the object.

})

here is an example to show the async in js.

     console.log('a');
     setTimeOut(function(){console.log('b')},0);
     console.log('c');

the order of the printing is a c b

(we have time out 0 but the function of the timeout goes in the event loop and take place after the function done)

for more information you can read https://developer.mozilla.org/he/docs/Web/JavaScript/EventLoop about the eventloop

edited Jan 17, 2016 at 13:06

answered Jan 17, 2016 at 12:47

Alon

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9 Comments

wyc Over a year ago

Thanks for the answer. But I get a type error:

Uncaught TypeError: Object function ParsePromise() {     _classCallCheck(this, ParsePromise);      this._resolved = false;     this._rejected = false;     this._resolvedCallbacks = [];     this._rejectedCallbacks = [];   } has no method 'all'

Alon Over a year ago

it should work maybe the problem with the const .. try use var to check

wyc Over a year ago

same problem. Maybe because I have to set the resolve and reject callbacks?

Alon Over a year ago

No. this not resole/reject. I am going to check it

Alon Over a year ago

Oh I forget foo().then I worte foo.then. You have to write foo().then()

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