davidcelis

Ruby on Ales

Outgrowing the Cloud (Mike Moore)

• Requests hitting the same load balancer can't handle HTTP and HTTPS at the same time because of SSL issues
• If you are trying to access an outside resource behind a firewall, you have to tell them every time you get a new webserver so they can whitelist the new IP
• If you know the IPs of your web servers and database servers, you can have requests hit these directly and bypass the load balancers.
• Could buy your own data center, but then you have to buy a load balancing router. Those are fucking expensive (tens or hundreds of thousands of dollars)

Glowin

(function(a, b) {
    function c(b, c) {
        var g = b.nodeName.toLowerCase();
        if ("area" === g) {
            var g = b.parentNode, i = g.name;
            if (!b.href || !i || "map" !== g.nodeName.toLowerCase())
                return !1;
            g = a("img[usemap=#" + i + "]")[0];
            return !!g && d(g)
        }

jcasimir

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

jonaslejon

define("DOMAIN", "test.se");
define("MAILGUN_API", "XXX123"); // Mailgun Private API Key

function br2nl($string) {
    return preg_replace('/\<br(\s*)?\/?\>/i', "\n", $string);
}
function mg_send($to, $subject, $message) {

  $ch = curl_init();

domi-papin

/*
 * picked from http://stackoverflow.com/questions/5186441/javascript-drag-and-drop-for-touch-devices
 *
 */
function touchHandler(event)
{
    // trick to add support for touch event to elements/widgets that do not support it 
    // by convetting convert touchevents into mouseevents

    // only apply this trick to ui-draggable elements

nightire

Routes

小心地使用 Match（Rails 3 已实现）

Rails 3 提供了 match 方法供我们自定义 routes，然而我们要小心使用它以避免“跨站脚本攻击”（XSS Attack）。比如像这样的 routes：

注：（r3 代表 Rails 3，r4 代表 Rails 4）

# routes.rb

seyhunak

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

fernandoaleman

brew tap homebrew/versions
brew install v8-315

gem install libv8 -v '3.16.14.13' -- --with-system-v8
gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8-315

bundle install

artero

Launch Sublime Text 2 from the Mac OS X Terminal

Sublime Text 2 ships with a CLI called subl (why not "sublime", go figure). This utility is hidden in the following folder (assuming you installed Sublime in /Applications like normal folk. If this following line opens Sublime Text for you, then bingo, you're ready.

open /Applications/Sublime\ Text\ 2.app/Contents/SharedSupport/bin/subl

You can find more (official) details about subl here: http://www.sublimetext.com/docs/2/osx_command_line.html

Installation

esperlu

#!/bin/sh

# Converts a mysqldump file into a Sqlite 3 compatible file. It also extracts the MySQL `KEY xxxxx` from the
# CREATE block and create them in separate commands _after_ all the INSERTs.

# Awk is choosen because it's fast and portable. You can use gawk, original awk or even the lightning fast mawk.
# The mysqldump file is traversed only once.

# Usage: $ ./mysql2sqlite mysqldump-opts db-name | sqlite3 database.sqlite
# Example: $ ./mysql2sqlite --no-data -u root -pMySecretPassWord myDbase | sqlite3 database.sqlite