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// Javascript Doubly Ended Queue
var deque = function() {
    var node = function(data, prev, next) {
        var that = {};
        that.data = data;
        that.prev = prev;
        that.next = next;
        return that;
    }

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// Javascript Doubly Ended Queue
var Dequeue = function() {
    this._head = new Dequeue.Node();
    this._tail = new Dequeue.Node();
    this._head._next = this._tail;
    this._tail._prev = this._head;
}

Dequeue.Node = function(data) {
    this._data = data;

dburger

# deployment
sudo gem install capistrano

# yeah rails
sudo gem install rails

# mongrel
sudo gem install mongrel

# xml processing in ruby

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# get up to date
sudo apt-get update
sudo apt-get upgrade

# basic development tools
sudo apt-get install emacs git-core subversion build-essential

# ruby stuff
sudo apt-get install ruby rdoc ri libopenssl-ruby ruby1.8-dev irb

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def field_changed?(attr, old, value)
  if column = column_for_attribute(attr)
    if column.type == :integer && column.null && (old.nil? || old == 0)
      # For nullable integer columns, NULL gets stored in database for blank (i.e. '') values.
      # Hence we don't record it as a change if the value changes from nil to ''.
      # If an old value of 0 is set to '' we want this to get changed to nil as otherwise it'll
      # be typecast back to 0 (''.to_i => 0)
      value = nil if value.blank?
    # else no!!!!!!!!!!! not the else branch
    #   value = column.type_cast(value)

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u = Unit.find(123)
u.position #=> 14
u.position = "14"
u.position_changed? #=> false

u = Unit.find(42)
u.position #=> 0
u.position = "0"
u.position_changed? #=> true

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[core]
	repositoryformatversion = 0
	filemode = true
	bare = true
	sharedrepository = 1
[receive]
	denyNonFastforwards = true

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ssh gitserver.com
mkdir -p /var/data/repos/myrepo.git
cd /var/data/repos/myrepo.git
git --bare init --shared=group

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namespace :data do

  # on my slow machine takes 5m09.209s
  desc 'Set positions per parent_id, position, short_name via SQL'
  task :sql_set_positions => :environment do
    parents_sql = 'SELECT DISTINCT parent_id FROM units'
    children_sql = %q{
      SELECT
          id FROM units
      WHERE

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namespace :data do

  desc 'Set positions per parent_id, position, short_name via stored procedure'
  task :sp_set_positions => :environment do
    sql = 'CALL set_positions()'
    puts sql
    ActiveRecord::Base.connection.execute(sql)
  end

end