quick api with express & mongoose.

api.js

'use strict';
import _ from 'lodash';

export default function api(model) {

  return {
    all(req, res) {
      let populate = req.query.populate ? req.query.populate : '';
      let find = req.query.find ? JSON.parse(req.query.find) : {};
      let sort = req.query.order ? JSON.parse(req.query.order) : {};

      let query = model
        .find(find)
        .populate(populate)
        .sort(sort)
        .exec((err, collection) => {
          if(err) return Promise.reject(err);
          return Promise.resolve(collection);
        });

      return query;
    },

    getOne(id, populate) {

      let query = model
        .findOne({_id: id})
        .populate(populate)
        .exec((err, item) => {
          if(err) return Promise.reject(err);
          return Promise.resolve(item);
        });

      return query;
    },

    get(req, res) {
      var populate = req.query.populate ? req.query.populate : '';
      return this.getOne(req.params.id, populate);
    },

    store(req, res) {
      var data = req.body;
      var Model = new model(data);
      var populate = req.query.populate ? req.query.populate : '';

      var query = Model
        .save()
        .then(result => {
          return this.getOne(result._id, populate);
        })
        .then(result => {
          return Promise.resolve(result);
        })
        .catch(err => {
          return Promise.reject(err.errors);
        });

      return query;
    },

    update(req, res) {
      var populate = req.query.populate ? req.query.populate : '';
      var id = req.params.id;

      model
      .update({_id: id}, req.body , {runValidators: true})
      .exec((err, result) => {
        if(err) return Promise.reject(err);

        this.getOne()
        .then(item => {
          return Promise.resolve(item);
        })
        .catch(err => {
          return Promise.reject(err.errors);
        });
      });
    },

    destroy(req, res) {
      model.findByIdAndRemove(req.params.id, (err) => {
        if(err) return res.status(400).json(err);
        return res.status(200).json({deleted: req.params.id});
      });
    },

    errortMessages(err) {

      var errors = [];

      _.mapValues(err, (val) => {
        var str = 'Cast to ObjectID failed for value';
        if(str.indexOf != -1)
        {
          arr.push('objectId error');
        } else {
          arr.push(val.message)
        }
      });

      return errors;

    }
  }
}