Parse : Chaining Promises

parse_promises_parallel.js

// Parse : Chaining Promises in Parallel

// File : utils/api.js
var Api = {};

Api.Count = function() {
  var promises = [];
  var shelf = new Parse.Query(Shelf);
  var note = new Parse.Query(Note);
  var book = new Parse.Query(Book);
  promises.push(shelf.count());
  promises.push(book.count());
  promises.push(note.count());

  return Parse.Promise.when(promises);
}

export default Api;

// Usage 
import Api from 'utils/Api';

Api.Count().then(function(counts){
  this.setState({
    counts: counts
  });
}.bind(this));

parse_promises_series.js

// Parse : Chaining Promises in Series

// File : utils/api.js
var Api = {};

Api.NewNote = function(note,file) {
  var file = new Parse.File(file.name, file);
  return file.save().then(function(file) {
    var promise = Parse.Promise.as();
    promise = promise.then( function() {
      var NewNote = new Note();
      if ( file.name ) {
        NewNote.set('file', file);
      }
      return NewNote.save(note);
    });
    return promise;
  });
}

export default Api;

// Usage 
import Api from 'utils/Api';

Api.NewNote(newNote, this.state.file).then(function(note){
  this.resetState();
  this.props.onNewNote(note);
}.bind(this));