Hung Phan hung-phan

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

Pub/Sub pattern with PostgreSQL's LISTEN/NOTIFY command

This is a simple chat-like program using pub-sub pattern, backed by PostgreSQL's LISTEN/NOTIFY command.

Publish

publish message to foo channel from user nickname.

$ python pub.py foo nickname
PUBLISH to channel #foo

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

Possible solutions

Reader Macros in Common Lisp

This post also appears on lisper.in.

Reader macros are perhaps not as famous as ordinary macros. While macros are a great way to create your own DSL, reader macros provide even greater flexibility by allowing you to create entirely new syntax on top of Lisp.

Paul Graham explains them very well in [On Lisp][] (Chapter 17, Read-Macros):

The three big moments in a Lisp expression's life are read-time, compile-time, and runtime. Functions are in control at runtime. Macros give us a chance to perform transformations on programs at compile-time. ...read-macros... do their work at read-time.

Moved to git repository: https://github.com/denji/jetbrains-cleanup-backup

Quick `uninstall` JetBrains settings:

curl -sL https://gist.github.com/denji/9731967/raw/jetbrains-uninstall.sh | bash -s

Quick `backup` JetBrains settings:

curl -sL https://gist.github.com/denji/9731967/raw/jetbrains-backup.sh | bash -s

	=Navigating=
	visit('/projects')
	visit(post_comments_path(post))

	=Clicking links and buttons=
	click_link('id-of-link')
	click_link('Link Text')
	click_button('Save')
	click('Link Text') # Click either a link or a button
	click('Button Value')

	class Api::RegistrationsController < Api::BaseController

	respond_to :json
	def create

	user = User.new(params[:user])
	if user.save
	render :json=> user.as_json(:auth_token=>user.authentication_token, :email=>user.email), :status=>201
	return
	else


	<html>
	<head>
	<title>Test</title>
	<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
	<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
	<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" />
	<script src="http://fb.me/react-0.5.1.js"></script>
	<script src="http://fb.me/JSXTransformer-0.5.1.js"></script>
	</head>

	(defn ignore-trailing-slash
	"Modifies the request uri before calling the handler.
	Removes a single trailing slash from the end of the uri if present.

	Useful for handling optional trailing slashes until Compojure's route matching syntax supports regex.
	Adapted from http://stackoverflow.com/questions/8380468/compojure-regex-for-matching-a-trailing-slash"
	[handler]
	(fn [request]
	(let [uri (:uri request)]
	(handler (assoc request :uri (if (and (not (= "/" uri))

	angular.module('myMdl', []).config(['$httpProvider', function($httpProvider) {
	$httpProvider.responseInterceptors.push([
	'$q', '$templateCache', 'activeProfile',
	function($q, $templateCache, activeProfile) {

	// Keep track which HTML templates have already been modified.
	var modifiedTemplates = {};

	// Tests if there are any keep/omit attributes.
	var HAS_FLAGS_EXP = /data-(keep\|omit)/;