node.js mongodb query in controller using MEAN stack

For this controller I am simply trying to return all the results of a collection. There is one item in the prop collection but for some reason I keep getting an undefined error.

TypeError: Cannot call method 'find' of undefined

This is my server.js file:

'use strict';

/**
 * Module dependencies.
 */
var mongoose = require('mongoose'),
passport = require('passport'),
logger = require('mean-logger');

   /**
 * Main application entry file.
 * Please note that the order of loading is important.
*/

// Initializing system variables
var config = require('./server/config/config');
var db = mongoose.connect(config.db);

// Bootstrap Models, Dependencies, Routes and the app as an express app
var app = require('./server/config/system/bootstrap')(passport, db);

// Return all results.
app.get('/all', function(req, res) {

  var d = db.prop.find();

  res.json(d);

});

// Start the app by listening on <port>, optional hostname
app.listen(config.port, config.hostname);

// Initializing logger
logger.init(app, passport, mongoose);

// Expose app
exports = module.exports = app;