Volodymyr valdemarua

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

In this article, I'll walk through a basic Rails (3.2.x) setup for creating a nested resource for two models. Nested resources work well when you want to build out URL structure between two related models, and still maintain a RESTful convention. This code assumes you are running RVM to manage Ruby/Gem versions, and Git for version control.

Creating a new Rails project

$ mkdir family # create rvm gemset 
$ echo "rvm use --create ruby-1.9.2@family" > family/.rvmrc 
$ cd family # install rails 
$ gem install rails # create new rails project 
$ rails new . # version control

	def convert_to_brightness_value(background_hex_color)
	(background_hex_color.scan(/../).map {\|color\| color.hex}).sum
	end

	def contrasting_text_color(background_hex_color)
	convert_to_brightness_value(background_hex_color) > 382.5 ? '#000' : '#fff'
	end

	def is_ajax_request?
	if respond_to? :content_type
	if request.xhr?
	true
	else
	false
	end
	else
	false
	end

	def tip(msg); puts; puts msg; puts "-"*100; end

	#
	# 30 Ruby 1.9 Tips, Tricks & Features:
	# http://www.igvita.com/2011/02/03/new-ruby-19-features-tips-tricks/
	#

	tip "Upgrading to Ruby 1.9 is simple: rvm install 1.9.2 && rvm --default 1.9.2"

	tip "Ruby 1.9 supports named captures in regular expressions!"

	upstream example_backend {
	server unix:/var/www/example.com/shared/unicorn.sock;
	}

	server {
	listen 80;
	server_name example.com www.example.com;
	access_log off;
	error_log off;
	client_max_body_size 20M;

	uk:
	errors:
	messages:
	expired: "прострочено, створіть новий"
	not_found: "не знайдено"
	already_confirmed: "вже було підтверджено, спробуйте увійти"
	not_locked: "не було заблоковано"
	not_saved:
	one: "Виникла помилка, через яку неможливо зберегти зміни:"
	other: "Виникли помилки (загалом - %{count}), через які неможливо зберегти зміни:"

	# ...

	gem 'carrierwave'
	gem 'fog', '~> 1.0.0' # Need to specify version, as carrierwave references older (0.9.0) which doesn't allow configuration of Rackspace UK Auth URL

	.ui-autocomplete {
	position: absolute;
	top: 100%;
	left: 0;
	z-index: 1000;
	float: left;
	display: none;
	min-width: 160px;
	_width: 160px;
	padding: 4px 0;