revskill10

require 'zmq'
context = ZMQ::Context.new
pub = context.socket ZMQ::PUB
pub.setsockopt ZMQ::IDENTITY, 'ping-pinger'
pub.bind 'tcp://*:5555'

i=0
loop do
  pub.send "ping pinger #{i+=1}" ; sleep 1
end

revskill10

# An example of elasticsearch & Tire setup for ActiveRecord associations.
#
# A `Book has_many :chapters` scenario, with mapping and JSON serialization
# for indexing associated models.
#
# Demonstrates three important caveats as of now:
#
# 1. You you have to use `touch: true` in the `belongs_to` declaration,
#    to automatically notify the parent model about the update.
#

revskill10

Install Rails 3.1

gem install rails

generate new app, skipping Test::Unit file generation

rails new my_app -T

Set up Gemfile

revskill10

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

revskill10

# Run with: rake environment elasticsearch:reindex

namespace :elasticsearch do
  desc "re-index elasticsearch"
  task :reindex => :environment do

    klass = Place
    ENV['CLASS'] = klass.name
    ENV['INDEX'] = new_index = klass.tire.index.name << '_' << Time.now.strftime('%Y%m%d%H%M%S')

revskill10

Sessions and Conversations

HTTP is a stateless protocol. Sessions allow us to chain multiple requests together into a conversation between client and server.

Sessions should be an option of last resort. If there's no where else that the data can possibly go to achieve the desired functionality, only then should it be stored in the session. Sessions can be vulnerable to security threats from third parties, malicious users, and can cause scaling problems.

That doesn't mean we can't use sessions, but we should only use them where necessary.

Adding, Accessing, and Removing Data

revskill10

ActiveAdmin.register Milestone do
  scope :all, :default => true
  scope :global
  scope :user_specific
  
  index do
    column :title
    column :description
    column :required_litres
    column :is_active

revskill10

#Model 

@user.should have(1).error_on(:username) # Checks whether there is an error in username 
@user.errors[:username].should include("can't be blank")  # check for the error message 

#Rendering
response.should render_template(:index)

#Redirecting 
response.should redirect_to(movies_path)

revskill10

Programming Achievements: How to Level Up as a Developer

This gist is part of a blog post. Check it out at:

http://jasonrudolph.com/blog/2011/08/09/programming-achievements-how-to-level-up-as-a-developer

revskill10

require 'rubygems'
require 'sinatra'

require 'fileutils'

# upload with:
# curl -v -F "data=@/path/to/filename"  http://localhost:4567/user/filename

post '/:name/:filename' do
  userdir = File.join("files", params[:name])