Integrate multiple roles instead of having only 1 role at the same time

[paduvi]

I had implemented it in a project, just modify features/users/actions/user.js action named 'findWithRole' and a little bit in config/passport.js:

action.findWithRole = function (conditions) {
        return Promise.coroutine(function*() {
            let user = yield app.models.user.find(conditions);
            let permissions = {
                feature: {},
                plugin: {}
            };
            if (!user)
                return null;
            yield Promise.map(user.role_ids, function (role_id) {
                return app.models.role.findById(role_id).then(function (role) {
                    let role_permissions = JSON.parse(role.permissions);
                    if (role_permissions.feature) {
                        Object.keys(role_permissions.feature).forEach(function (key) {
                            permissions.feature[key] = _.union(permissions.feature[key], role_permissions.feature[key]);
                        });
                    }
                    if (role_permissions.plugin) {
                        Object.keys(role_permissions.plugin).forEach(function (key) {
                            permissions.plugin[key] = _.union(permissions.plugin[key], role_permissions.plugin[key]);
                        });
                    }
                });
            });
            user = user.toJSON();
            user.role = {
                permissions: JSON.stringify(permissions)
            };
            return user;
        })();
    };

But it will return req.user as a raw JSON object instead of Sequelize model as before. You guys can consider to refer it.