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Transactions

As your business logic gets complex you may need to implement transactions. The classic example is a bank funds transfer from account A to account B. If the withdrawal from account A fails then the deposit to account B should either never take place or be rolled back.

Basics

All the complexity is handled by ActiveRecord::Transactions. Any model class or instance has a method named .transaction. When called and passed a block, that block will be executed inside a database transaction. If there's an exception raised, the transaction will automatically be rolled back.

Example

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已经读完的书：

• Growing Rails Applications in Practice

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controllers = Dir.new("#{Rails.root}/app/controllers/admin").entries
controllers.each do |controller|
  if controller =~ /_controller/
    cont = controller.camelize.gsub(".rb","")
    cont1 = controller.gsub("_controller.rb", "")
    (eval("Admin::#{cont}.action_methods")).sort.each {|met|
      puts "admin/#{cont1}##{met}"
    }
  end
end

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unless Rails.env.production?
  connection = ActiveRecord::Base.connection
  connection.tables.each do |table|
    connection.execute("TRUNCATE #{table}") unless table == "schema_migrations"
  end

  sql = File.read('db/import.sql')
  statements = sql.split(/;$/)
  statements.pop

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require 'mechanize'

a = Mechanize.new
File.open('links.txt', 'w') do |file|
  a.get('http://kuai.xunlei.com/d/z51zDAKLFgAjwMdT993') do |page|
    links = page.links_with(class: 'file_name')
    links.each do |l|
      file.write(l.href + "\n")
    end
  end

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bundle exec guard -P livereload

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Enable tab completion for JSX with Emmet in Atom

This guide assumes you have the emmet and language-babel packages already installed in Atom

1. Open the keymap.cson file by clicking on Atom -> Keymap… in the menu bar
2. Add these lines of code to your keymap:

'atom-text-editor[data-grammar~="jsx"]:not([mini])':

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require 'mina/git'
require 'mina/nginx'

set :application, 'your_app_name'
set :domain, 'your_server'
set :user, 'ubuntu'
set :deploy_to, '/location/to/deploy'
set :app_path, "#{deploy_to}/#{current_path}"
set :repository, 'your_repo'
set :branch, 'master'