CODEWITHSUNDEEP
javascriptparse-platform
wyc
wyc

Reputation: 55263

How to return an object from a Parse query?

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'

Upvotes: 1

Views: 228

Answers (1)

Alon
Alon

Reputation: 2929

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

Upvotes: 1

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