3014zhangshuo

常用的几个 Ruby 版本管理工具有：rvm，rbenv，ry，rbfu。rvm 应该是最早出现、使用最多的，因为过于强大以至于违背了某个 Linux 软件开发原则，所以出现了很多轻便的替代者，其中来自 37signals 的 rbenv 就很受欢迎。ry 和 rbfu 看上去更轻便，不过使用不广泛。之前使用过rvm, 这次尝试下rbenv。

我的环境是 Ubuntu14.04

1. 安装 rbenv

rbenv的源代码托管在github，在终端中，从 github 上将 rbenv 源码 clone 到本地，然后设置 $PATH。

git clone git://github.com/sstephenson/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc

3014zhangshuo

# See http://m.onkey.org/running-rails-performance-tests-on-real-data
# fixed to work with Rails 3.2.8

# START : HAX HAX HAX
# Load Rails environment in 'test' mode
RAILS_ENV = "test"
require File.expand_path('../../config/environment', __FILE__)

# Re-establish db connection for 'performance' mode
silence_warnings { RAILS_ENV = "performance" }

3014zhangshuo

source 'https://rubygems.org'

gem 'rails', '3.2.3'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  # See https://github.com/sstephenson/execjs#readme for more supported runtimes

3014zhangshuo

create_table :media_items do |t|
  t.string :type, :null => false, :limit => 32
  t.string :name
  t.timestamps
end

class MediaItem < ActiveRecord::Base
  validates_presence_of :kind
end

3014zhangshuo

cat access.log.1 | grep " 500 " | awk -F'"' '{print $2,",",$4,",",$6}' > /home/ubuntu/500.log
cat access.log.1 | grep " 404 " | awk -F'"' '{print $2,",",$4,",",$6}' > /home/ubuntu/404.log

3014zhangshuo

# autoload concerns
module YourApp
  class Application < Rails::Application
    config.autoload_paths += %W(
      #{config.root}/app/controllers/concerns
      #{config.root}/app/models/concerns
    )
  end
end

3014zhangshuo

Make /robots.txt aware of the Rails environment

You probably don't want Google crawling your development staging app. Here's how to fix that.

$ mv public/robots.txt config/robots.production.txt
$ cp config/robots.production.txt config/robots.development.txt

Now edit config/routes.rb to add a route for /robots.txt, and add the controller code.

3014zhangshuo

# config/routes.rb
resources :documents do
  scope module: 'documents' do
    resources :versions do
      post :restore, on: :member
    end

    resource :lock
  end
end

3014zhangshuo

# config/routes.rb
resources :documents do
  scope module: 'documents' do
    resources :versions do
      post :restore, on: :member
    end

    resource :lock
  end
end

3014zhangshuo

# No yielding

class NormPerson
  attr_accessor :first, :last
  def initialize(first = nil, last = nil)
    @first = first
    @last = last
  end
  def hello
    puts "#{@first} #{@last} says hello!"