lb-promisify

lb-promisify is the Loopback addon which adds promises to PersistedModel methods by default, but can be extended.

1. Installation

npm install lb-promisify --save

2. Configuration

server/server.js.json

...

var promisify = require('lb-promisify')

...

boot(app, __dirname);
promisify(app);

...

3. Basic use

var User = app.models.User,
    Post = app.models.Post;

User
    .findById('user-id')
    .then(function(user) {
        return Post.find({ where: { authorId: user.id }});
    })
    .then(function(posts) {
        // do something with posts
    })
    .catch(function(err) {
        console.log(err);
    });

4. Advanced use

You can promisify more methods by add definitions. Before:

promisify(app);

you can add something like this

promisify.add('isValid',
    true,
    function (deferred) {
        return function (valid) {
            if(valid) {
                deferred.resolve();
            }
            else {
                deferred.reject();
            }
        }
    });