api.js

var onionrm = require('onionrm');
var express = require('express');
var openDb = require('./database.js');
var app = express();

app.get('/api/updates/:model', function (req, res) {
  var filter = {
    updated_at: onionrm.gte(req.query.timestamp)
  };
  openDb(function(err, models, closeDb){
    //TODO: check for errors

    var lookup = {
      'campgrounds': models.Campground,
      'campground_reviews': models.CampgroundReview,
      'campground_photos': models.CampgroundPhoto
    };
    var model = lookup[req.params.model];
    if(!model){
      //TODO: error
    }

    model.find(filter, function(err, records){
      //TODO: check for errors
      res.json(records);
    });
  });

});

app.listen(5000);