Error when using promises to retrieve object from mongo db

Question

Folks, I am trying to wrap the following with promises, and return a Mongo document.

Controller's catch is getting error: 'TypeError: Cannot call method \'apply\' of undefined'

What is the proper way to return the Object from the db to the controller?

Controller:

Q.fcall(Users.fetchId(authId)).then(function userVerification(userObject) {
    console.log ('got back',userObject);
    responses.Unauthorized('Unauthorized ID', res);
}).catch(function handleError(err) {
    responses.InternalServerError(''+err, res);
});

Users Model:

Users.prototype.fetchId = function fetchId(authId) {
    return this.mongodb.fetchId(authId);
};

Mongo:

MongoDatabase.prototype.fetchId = function fetchId(id) {
    var result = {}
    return this.authDB.query('users', function(collection) {
        return collection.findOne({_id:id}, function (err, doc) {
            if (!_.isEmpty(doc)) {
                var result = doc;
            }
            console.log ('mongo',result);
            return result;
        });
    });
};

vis · Accepted Answer · 2014-08-19 20:06:19Z

2

Q.fcall takes a function as its first parameter, and then arguments to apply to that function. By passing it Users.fetchId(authId), you're passing it the result of calling that function.

Try passing the function, and then the arguments you want to apply to it:

Q.fcall(Users.fetchId, authId).then( fn )

answered Aug 19, 2014 at 20:06

vis

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1 Comment

Cmag Over a year ago

hmmm, now mongo never gets called. The Users Model errors out with { error: 'TypeError: Cannot read property \'mongodb\' of undefined' }

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