prcaen

## CONSOLE
# Routes for a controller
rake routes CONTROLLER=products


## CONTROLLER
# Redirect to referrer
redirect_to :back # raise RedirectBackError if no referer

# Before filter and after filter in a same method

prcaen

:binary # blob
:boolean # tinyint
:date # date
:datetime # datetime
:decimal # decimal
:float # float
:decimal # decimal
:integer # int(11)
:string # varchar(255)
:text # text

prcaen

- save
- valid
before_validation
- validate
after_validation
before_save
before_create
- create
after_create
after_save

prcaen

Reserved Words:

ADDITIONAL_LOAD_PATHS
ARGF
ARGV
ActionController
ActionView
ActiveRecord
ArgumentError
Array

prcaen

class Model < ActiveRecord::Base
  attr_accessible :value, :other_value
  default_scope

  #  =================
  #  =   RELATIONS   =
  #  =================

  #  =================
  #  =   CALLBACKS   =

prcaen

require "benchmark"

n = 5000000

Benchmark.bmbm do |x|
  x.report("while:")      { i = 1; while i < n do; a = "1 and #{i}"; i += 1; end }
  x.report("for loop:")   { for i in 1..n; a = "1 and #{i}"; end }
  x.report("times:")      { n.times do |i|   ; a = "1 and #{i}"; end }
  x.report("upto:")       { 1.upto(n) do |i| ; a = "1 and #{i}"; end }
  x.report("until:")      { i = 1; until i > n do; a = "1 and #{i}"; i += 1; end }

prcaen

Bash profile

alias alphahex='echo -n "Enter percentage: " ; read opt ; echo "obase=16; ibase=10; (255*$opt+50)/100" | bc'

Command

Replace XX by percentage.

echo "obase=16; ibase=10; (255*XX+50)/100" | bc

prcaen

Rspec

Commands

• rspec spec/ --format d*: Documentation output

Capybara

Methods

• save_and_open_page: Open integration page at the break point

prcaen

// How make the ActionBar title clickable on Android under API 11 (1/2)

private static final boolean API_LEVEL_UNDER_11 = android.os.Build.VERSION.SDK_INT < 11;
private boolean navigationDrawerEnabled = true; // Useful if your app need navigation drawer

@Override
protected void onCreate(Bundle savedInstanceState) {
  if (API_LEVEL_UNDER_11) {
    getSupportActionBar().setCustomView(R.layout.partial_actionbar);
    getSupportActionBar().setDisplayShowCustomEnabled(true);

prcaen

# Restrict access to website and fallback to password.
<Directory "/var/sites/SITE/">
  AllowOverride All
  AuthType Basic
  AuthName "Restricted Files"
  AuthUserFile /var/sites/SITE/.htpasswd
  Require user
  Order allow,deny
  Allow from 127.0.0.1
  Satisfy Any