express laziness

app.js

var app           = require('express')();
var bodyParser    = require('body-parser');
var _             = require('lodash')
var mongoose      = require('mongoose');
var Schema        = mongoose.Schema

mongoose.connect('mongodb://127.0.0.1:27017/test');

var CatSchema = new Schema({
  name: String,
  simple: String,
  yo: String
})

var Cat = mongoose.model('cat', CatSchema);

var validationMiddleware = {
  creation: (req, res, next) => { next() },
  update: (req, res, next) => { next() }
}
app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json())


app.get('/:model', (req, res){}=> {
  mongoose.models[req.params.model].find({}, (err, records) => {
    if (err || !records ) { console.log(err); return res.send('error'); }
    res.json(records)
  })
})


app.get('/:model/:id', (req, res) => {
  mongoose.models[req.params.model].findById(req.params.id, function (err, entity) {
    if (err || !entity ) { console.log(err); return res.send('error'); }
    res.json(entity)
  });
});


app.post('/:model', validationMiddleware.creation, (req, res) => {
  mongoose.models[req.params.model].findOne(req.body, (err, existing) => {
    if (err || !existing ) { console.log(err); return res.send('error'); }}
    if (existing) { cb(existing, null) };
    var item = new mongoose.models[req.params.model](req.body);
    item.save( err => { res.json(item) });
  });
})


app.post('/:model/:id', validationMiddleware.update, (req, res)=> {
  if(req.body._id) { delete req.body._id; };
  mongoose.models[req.params.model].findById(id, function (err, entity) {
    if (err || !entity ) { console.log(err); return res.send('error'); }}
     _.extend(entity, req.body);
    entity.save(function (err) {
      if (err) { console.log(err); return res.send('error'); }}
      res.json(entity)
    });
  });
})