Parse.Promise can't catch an error

Question

I'm working on a project which use Parse.com npm package in NodeJS, and here is a problem:

  Parse.Promise.as(true).then(function() {
    throw new Error('here is an error');
  }).then(function(done) {
    console.log('done', done);
  }, function(err) {
    console.log('err', err);
  });

This code should logs "err" and "here is an error". But it's not. Just thrown the error immediately like this:

Error: here is an error
    at module.exports.app.get.res.title.js.css.route.noChat (/Users/Nemo/dev/workspace/snapfitWeb/lib/event.js:10:11)
    at wrappedResolvedCallback (/Users/Nemo/dev/workspace/snapfitWeb/node_modules/parse/build/parse-latest.js:4082:40)
    at /Users/Nemo/dev/workspace/snapfitWeb/node_modules/parse/build/parse-latest.js:4144:35
    at runLater (/Users/Nemo/dev/workspace/snapfitWeb/node_modules/parse/build/parse-latest.js:4127:14)
    at _.extend.then (/Users/Nemo/dev/workspace/snapfitWeb/node_modules/parse/build/parse-latest.js:4143:9)
    at module.exports.app.get.res.title.js.css.route.noChat (/Users/Nemo/dev/workspace/snapfitWeb/lib/event.js:9:26)
    at Object.<anonymous> (/Users/Nemo/dev/workspace/snapfitWeb/lib/event.js:17:3)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)

Environment: Node v0.10.38 [email protected] [email protected]

Answer 1

To convey an error to the error callback, return a rejected promise, like this:

Parse.Promise.as(true).then(function() {
    return Parse.Promise.error("here is an error");
}).then(function(done) {
    console.log('done', done);
}, function(err) {
    console.log('err', err);
});