speed-of-light

gem install nokogiri -- --with-xml2-include=/usr/include/libxml2/libxml \
--with-xml2-lib=/usr/lib64/ \
--with-sxlt-include=/usr/include/libxslt \
--with-xslt-lib=/usr/lib64/

speed-of-light

function gcst(){
  # $1: repo path
  # $2: tag-name

  git clone $1
  cd ${$1%%.*}
  git tag -l
  git checkout $2
  git branch -D master
  git checkout -b master

speed-of-light

desc 'Pretty version on rails rake routes.'
# modified from https://github.com/nicooga/color_routes
# put this file under your [rails.root]/lib/tasks/
# tested under rails 4.0.0
# Default usage:
# $>>> rake color_routes
# Routes with specific controller
# $>>> rake color_routes controller=devise/sessions
# Routes with multiple filters
# $>>> rake color_routes path=login verb=GET

speed-of-light

# install something
sudo apt-get install postgresql postgresql-contrib

# check login ability
sudo -u postgres psql

# create user with passwords in shell
sudo -u postgres createuser $UserName -P

# try login as the created user

speed-of-light

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

speed-of-light

Render and Redirect

The normal controller/view flow is to display a view template corresponding to the current controller action, but sometimes we want to change that. We use render in a controller when we want to respond within the current request, and redirect_to when we want to spawn a new request.

Render

The render method is very overloaded in Rails. Most developers encounter it within the view template, using render :partial => 'form' or render @post.comments, but here we'll focus on usage within the controller.

:action

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class Ability
  include CanCan::Ability
 
  def initialize(user)
 
    user ||= User.new # This is used for not logged user if you have a need for it 
 
    if User.current_role == 'admin' # From ApplicationController we can get current_role and check it up against the role we want.
      can :manage, :all 
    else

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# Guide
# Configure the essential configurations below and do the following:
# 
#   Repository Creation:
#     cap deploy:repository:create
#     git add .
#     git commit -am "initial commit"
#     git push origin master
# 
#   Initial Deployment:

speed-of-light

Github 發 Pull Request & 貢獻流程速查

前言

此文目標讀者需先自行學會

• 開 Github 帳號
• 會 fork 程式 repository
• 會在自己的電腦使用命令列 git
• 會 clone 自己的 repository

speed-of-light

#Session controller provides a token
#/controllers/api/sessions_controller.rb
class Api::SessionsController < Devise::SessionsController
  before_filter :authenticate_user!, :except => [:create]
  before_filter :ensure_params_exist, :except => [:destroy]
  respond_to :json

  def create
    resource = User.find_for_database_authentication(:email => params[:user_login][:email])
    return invalid_login_attempt unless resource