also i want to recommend the website “building virtual worlds” which hosts content of a class founded by randy pausch dealing with interactive worlds and virtual realities that are built by students. you can watch a video of one of the funniest worlds below.

February 17th - Hamburg, Germany - Docks
On Sale Friday, November 23rd
Tickets available at www.eventim.de or www.kartenhaus.de

February 19th - Oslo, Norway - Sentrum
On sale Saturday November 24th
Tickets available at www.billettservice.no or by calling +47 815 33 133

February 20th - Stockholm, Sweden - Cirkus
On sale Wednesday November 21st
Tickets available at www.ticnet.se or by calling +46 8 660 1020

February 22nd - Copenhagen, Denmark - Vega
On sale NOW
Tickets available at www.billetlugen.dk

February 24th - Berlin, Germany - Huxleys
On Sale Friday, November 23rd
Tickets available at www.eventim.de or www.kartenhaus.de

February 26th - Zurich, Switzerland - Volkshaus
On Sale Friday, November 23rd
Tickets available at www.ticketcorner.com or www.starticket.ch

February 27th - Milan, Italy - Alcatraz
On Sale Wednesday, November 21st
Tickets available at www.ticketone.it

February 29th - Madrid, Spain - La Riviera
On Sale Friday, November 30th
Tickets available at: www.iguapop.com, www.servicaixa.com, or by calling: 902.10.12.12

March 1st - Barcelona, Spain - Razzamatazz
On Sale Friday, November 30th
Tickets available at: www.iguapop.com, www.servicaixa.com, or by calling: 902.10.12.12

March 3rd - Munich, Germany - Elser Halle
On Sale Friday, November 23rd
Tickets available at www.eventim.de or www.kartenhaus.de

March 5th - Paris, France - Olympia
On Sale Saturday, November 24th
Tickets available at: www.fnacspectacles.com and www.olympiahall.com

March 6th - Tilburg, Netherlands - 013 Music Hall
On Sale Saturday, November 24th
Tickets available at: www.ticketservice.nl

March 8th - Cologne, Germany - Live Music Hall
On Sale Friday, November 23rd
Tickets available at www.eventim.de or www.kartenhaus.de

March 9th - Brussels, Belgium - Ancienne Belgique
On Sale Wednesday, November 21st
Tickets available at: www.abconcerts.be or by calling +32 2 548 24 24

March 11th - Glasgow, Scotland - Academy
On Sale Monday, November 26th
Tickets available at: www.pclpresents.com or by calling 08700 600 100

March 13th - Manchester, UK - Apollo
On Sale Tuesday, November 27th
Tickets available at: www.gigsandtours.com

March 14th - London, UK - Brixton Academy
On Sale Tuesday, November 27th
Tickets available at: www.gigsandtours.com

• 69% of organisations have adopted agile techniques so far
• the most effective agile practices are “iterative development” and “regular delivery of working software”
• one-third of projects are done with two week iterations
• 44% of organisations had a success rate of 90% or above for agile projects
• project success rate for agile projects is 10% higher than for “traditional” projects
• only 42% of offshoring projects are successful, but they are considerably more succesful in asia than in the rest of the world
• the number of successful projects is dropping significantly for teams larger than 10 members
• 80% of it-managers and 70% of project managers put the needs of their staff over beeing on time and on budget
• 70-80% of it-personnel see a healthy workplace beeing more important than beeing on time and on budget, but only 53% of business stakeholders share this opinion

if googlevideo doesn’t work, try here for a windows media player link.

some nice slowmo moves of his airness…

class WorkingTime < ActiveRecord::Base

  belongs_to  :project

  validates_presence_of :project, :message => 'Please select a project!'
  validates_associated :project
  validates_presence_of :hours_worked

end

class Project < ActiveRecord::Base
  has_many :working_times
end

the input form to create an instance of this model looks something like this:

[...]
<%= error_messages_for 'working_time' %>

<label for="project_of_working_time">Project</label>
<%= select :working_time, :project_id,
    Project.find(:all).collect {|p| [ p.name, p.id ] },
    { :include_blank => true }, :class => "working_time_select" %>

<label for="working_time_hours_and_minutes_worked">Hours Worked</label>
<%= text_field 'working_time', 'hours_worked', :size => 5  %>

[...]

now if you try to save the form without selecting a project an appropriate error message is shown. this is not really remarkable. but the problem is that the select input field isn’t highlighted correctly like other input fields (i.e. the hours_worked if it is empty). i had a hard time to figure out the reason for this.

the error highlighting is based on the errors object that is passed to the view in case of validation errors. when the view is evaluated every input field looks in this object for an error associated to it by its name. if the method errors.on(name of input field) returns a value, a html-snipped is wrapped around the input field (btw, if you want to change the snipped, look here). here is an example for the input textfield hours_worked:

<div class="fieldWithErrors">
<input id="workind_time_hours_worked"
     name="working_time[hours_worked]" size="5" type="text" value="" />
</div>

the issue with the above mentioned working_time / project relation is that the validation error is mapped to the field project and not to project_id, since this is what i described in the model working_time. because the view cannot get the link to the project-error, the field will not be highlighted. you can validate this with a unit-test:

require 'working_time'

class WorkingTimeTest < Test::Unit::TestCase

  def test_create_without_project
    @working_time = WorkingTime.new
    @working_time.hours_worked = 3
    result = @working_time.save
    assert !result
    errors = @working_time.errors
    assert_not_nil errors[:project]
    assert includes_match?(errors[:project], 'Please select a project!')
  end
end

the only solution is to change the validation in the working_time model from project to project_id. this is quite confusing because the working_time model actually doesn’t have a project_id field. what makes this even worse is that you also get validation errors if a project instance will be set in the working_time model. therefore the following test always fails:

require 'working_time'
require 'project'

class WorkingTimeTest < Test::Unit::TestCase

  def test_create_with_project
    @working_time = WorkingTime.new
    @working_time.hours_worked = 3
    @working_time.project = Project.find(1)
    result = @working_time.save
    assert result
  end
end

i hope this issue will be fixed in a future version of rails.