Promise returns undefined

Question

Promise returns undefined

I know you cannot make an asynchronous function behave synchronously, but how do you add some ordering to the promises chain?

One result depends on the previous value of the promise, and when it doesn't, I get an undefined error. This is an HTTP request, so it relies on external factors like how fast my connection can complete the request, etc.

module.exports.movieCheck = function(authToken) {
return request({
    method : 'GET',
    uri : 'https://graph.facebook.com/' + profileID + '/posts?fields=message&limit=25&' + authToken
    }).spread(function (response, body) {
        console.log('https://graph.facebook.com/' + profileID + '/posts?fields=message&limit=25&' + authToken);
        return body;
    }, function(e) {
        console.log(e);
});
};

I am calling the above method as follows. However console.log returns undefined.

movieCheck.getToken()
.then(function(token) {
  movieCheck.movieCheck(token);
})
.then(function(movies) {
  console.log(movies); //should print json data
});

Terminal fingerprints

undefined
https://graph.facebook.com/.../posts?fields=message&limit=25&access_token=....

+3

javascript node.js promise bluebird

mremane 09 jul. '15 at 11:00

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1 answer

Arun p johny · Accepted Answer · 2015-07-09T11:02:37+0000

Try to return the promise from the first and then the callback

movieCheck.getToken()
    .then(function (token) {
    return movieCheck.movieCheck(token);
}).then(function (movies) {
    console.log(movies); //should print json data
});

Promise returns undefined

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