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<form action="<%= @pay_desc['mrh_url'] %>" method="post">
  <input type=hidden name=MrchLogin value="<%= @pay_desc['mrh_login'] %>">
  <input type=hidden name=OutSum value="<%= @pay_desc['out_summ'] %>">
  <input type=hidden name=InvId value="<%= @pay_desc['inv_id'] %>">
  <input type=hidden name=Desc value="<%= @pay_desc['inv_desc'] %>">
  <input type=hidden name=SignatureValue value="<%= @pay_desc['crc'] %>">
  <input type=hidden name=Shp_item value="<%= @pay_desc['shp_item'] %>">
  <input type=hidden name=IncCurrLabel value="<%= @pay_desc['in_curr'] %>">
  <input type=hidden name=Culture value="<%= @pay_desc['culture'] %>">
  <input type=submit value='Оплатить'>

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# Speed things up by not loading Rails env
config.assets.initialize_on_precompile = false

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Tested on: Datatable 1.8.2, Rails 3.1.3
This example uses Coffeescript and Haml (you should too :-) )

The following is an example of Datatables server-side processing of a table 
which displays a user's song list including the songs' artist names.  In 
Rails, Song and Artist are ActiveRecord models in a one artist-many song relat.

1a. the Rails controller code

class SongsController < ApplicationController

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1. Add gem 'delayed_job', '2.1.4' to your Gemfile

2. Run bundle install

3. Run rails g migration create_delayed_jobs

4. Edit the created migration to contain:

    class CreateDelayedJobs < ActiveRecord::Migration
      def self.up
        create_table :delayed_jobs, :force => true do |table|
          table.integer  :priority, :default => 0      # jobs can jump to the front of
   

table.integer :attempts, :default => 0 # retries, but still fail eventually

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# derived from http://railscasts.com/episodes/340-datatables
# handles server side multi-column searching and sorting

class Datatable
  delegate :params, :h, :raw, :link_to, :number_to_currency, to: :@view

  def initialize(klass,view)
    @klass = klass
    @view = view
  end

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tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

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# When calling a method with a splat then the parameters are passed as a comma separated list
# When receiving arguments with a splat then they are converted into an Array
# When using a double splat (2.0+) then the argument is converted into a Hash (i.e. named parameters)

def foo(*args)
  p args
end

foo 'a', 'b', 'c'
# => ["a", "b", "c"]

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# Sample implementation of quicksort and mergesort in ruby
# Both algorithm sort in O(n * lg(n)) time
# Quicksort works inplace, where mergesort works in a new array

def quicksort(array, from=0, to=nil)
    if to == nil
        # Sort the whole array, by default
        to = array.count - 1
    end

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Deploy Rails app to digitalocean with nginx, unicorn, capistrano & postgres

Create Droplet

Create droplet of your liking (ubuntu 12.10 x32)

Setup DNS

On Digital Ocean, create a DNS entry for your server (xyz.com)

Make sure it has NS records that use digital oceans nameservers

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# Login as root
ssh root@domain

# Create deploy user
adduser <username> #Adds User with username given. Enter Password when Prompted. Other Details are Optional
# Add user to sudo group
usermod -g <groupname> <username>

# Add .ssh/authorized_keys for deploy user