Filter notifications by severity

[mueller-ma]

I'd like to filter the notification list in the Android app by severity, but for this the notifications API needs to be extended:

1. Add an endpoint that returns all severities used in the last X days. X could be hardcoded to e.g. 60.
2. Add a query parameter to the current notification endpoint, e.g. &severity="high"

[iPavel89-work]

file routes/api.js

exports.notificationsget = function (req, res) {
    var limit = req.query.limit > 0 ? parseInt(req.query.limit) : 10,
        skip = req.query.skip > 0 ? parseInt(req.query.skip) : 0;
    var filter = { user: req.user.id };

    // Добавляем фильтр по параметру severity, если он указан в запросе
    if (req.query.severity) {
        filter.severity = req.query.severity;
    }
    
    Notification.find(filter, '-user')
        .limit(limit)
        .skip(skip)
        .sort({ created: 'desc' })
        .exec(function (error, notifications) {
            if (!error) {
                res.status(200).json(notifications);
            } else {
                return res.status(500).json({
                    errors: [{
                        message: "Error getting notifications"
                    }]
                });
            }
        });
};