index.js

'use strict';

let _model = null;

module.exports = class Crud {

    static model (model) {
        _model = model;
    };

    static list (req, res) {
        let limit = req.query._limit;
        delete req.query._limit;
        let skip = req.query._skip;
        delete req.query._skip;
        let sort = req.query._sort;
        delete req.query._sort;
        let count = req.query._count;
        delete req.query._count;
        let params = req.query || {};

        _model.find(params)
            .limit(limit)
            .skip(skip)
            .sort(sort)
            .exec((err, data) => {
                if (err) {
                    return res.status(500).json({ success: false, message: err });
                }

                if (!count) {
                    return res.status(200).json({ success: true, data: data });
                }

                _model.count(params, (err, count) => {
                    if (err) {
                        return res.status(500).json({ success: false, message: err });
                    }

                    return res.status(200).json({ success: true, data: data, count: count });
                });
            });
    };

    static create (req, res) {
        let data = new _model(req.body);
        data.save(err => {
            if (err) {
                return res.status(500).json({ success: false, message: err });
            }
            return res.status(200).json({ success: true, data: data });
        });
    };

    static findById (req, res) {
        _model.find({ _id: req.params.id }, (err, data) => {
            if (err) {
                return res.status(500).json({ success: false, message: err });
            }

            if (!data) {
                return res.status(404).json({ success: false, message: 'Not found' });
            }

            return res.status(200).json({ success: true, data: data });
        });
    };

    static update (req, res) {
        let query = { _id: req.params.id };
        _model.find(query, (err, data) => {
            if (err) {
                return res.status(500).json({ success: false, message: err });
            }

            if (!data) {
                return res.status(404).json({ success: false, message: 'Not found' });
            }

            _model.update(query, { $set: req.body }, err => {
                if (err) {
                    return res.status(500).json({ success: false, message: err });
                }

                return res.status(200).json({ success: true });
            });
        });
    };

    static delete (req, res) {
        let query = { _id: req.params.id };
        _model.find(query, (err, data) => {
            if (err) {
                return res.status(500).json({ success: false, message: err });
            }

            if (!data) {
                return res.status(404).json({ success: false, message: 'Not found' });
            }

            _model.remove(query, err => {
                if (err) {
                    return res.status(500).json({ success: false, message: err });
                }
                return res.status(200).json({ success: true });
            });
        });
    };

};