Miroslav Bajtoš bajtos

The instructions and the sample-data file were moved to https://github.com/bajtos/loopback-workshop.

This is an extra exercise for the workshop Building a full-stack application with LoopBack and AngularJS.

Add a custom model method

Let's write a method Whiskey.prototype.ratingStats that will provide a breakdown of rating data for a given whiskey. This method should be defined in common/models/whiskey.js. Below is a template, it's up to the reader to implement the statistical computation.

This is an extra exercise for the workshop Building a full-stack application with LoopBack and AngularJS.

Switch to MySQL

Now that we have the first version of our application ready, let's switch the storage backend from an in-memory database to MySQL.

Install loopback-connector-mysql

LoopBack Components - a strawman proposal

Component definition

Metadata

Component metadata is stored in package.json under loopback-component property.

Imagine a chat server persisting the messages, a simplified Slack chat. The domain is designed in the object-orientated style. In order to get realtime updates, we need to transport events emitted on the model constructor ("static" events) and on a model instance ("instance" events).

While it may not be immediately clear, the example is covering few other important LoopBack concepts too:

authorization (loopback.token in REST)
current context (loopback.context in REST)

What is not covered:

file uploads and downloads

API to group test cases into test suites, e.g. describe and it
setup/teardown hooks (before, beforeEach, after, afterEach)
Support for promises: test case returns a promise, the test runner waits until the promise is resolved
Output formatters: junit/xunit for CI, spec-like for humans (a list of failed tests is printed again at the end)
Run all tests in a single file, run a single test case, run a single test suite.

THE STATUS IS NO LONGER TRUE, WE HAVE ADDED OPERATION HOOKS SINCE THEN.

SEE http://docs.strongloop.com/display/LB/Operation+hooks

Current status as of 2015-01-15

At the moment, LoopBack provides two kinds of hooks:

	var jdb = require('./');
	var ModelBuilder = jdb.ModelBuilder;
	var DataSource = jdb.DataSource;
	var Memory = require('./lib/connectors/memory');
	var assert = require('assert');
	var ID = 'custom-generated-id';

	var memory = new DataSource({connector: Memory});
	var modelBuilder = memory.modelBuilder;

	function createLoopBackApp() {
	var app = express();
	// add loopback stuff

	app.phase('routes').use(function(req, res, next) {
	if (app._router) {
	app._router.handle(res, res, next);
	} else {
	next();
	}

	// Call fs.stat over and over again really fast.
	// Then see how many times it got called.
	// Yes, this is a silly benchmark. Most benchmarks are silly.

	var path = require('path');
	var common = require('../common.js');
	var fs = require('fs');

	var FILES = [
	require.resolve('../../lib/assert.js'),