gistfile1.txt

   _.reduce(req.body.labels,
            (promise, requestLabel) => promise.then(
                () => {
                    var label = new model.Label(requestLabel);
                    label.branch = DISTRIBUTION_BRANCH_ID;
                    return labelsService.createLabel(label);
                }
            ),
            Promise.resolve()
        ).then(
            () => res.sendStatus(200),
            err => next(Error.create('An error occurred trying to save the labels.', {
                labels: req.body.labels
            }, err))
        )