ryanb

def test_delete_middle
  assert_equal [1, 2, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)

  ListMixin.find(2).destroy

  assert_equal [1, 3, 4], ListMixin.find(:all, :conditions => 'parent_id = 5', :order => 'pos').map(&:id)

  assert_equal 1, ListMixin.find(1).pos
  assert_equal 2, ListMixin.find(3).pos
  assert_equal 3, ListMixin.find(4).pos

ryanb

Creating a Multi Page Form in Rails

Creating a multi-step wizard-like form is pretty difficult in Rails. 
Especially when trying to apply REST and validations. There are many 
different approaches to this problem, and the right one depends largely 
on your application details. Here are four options, and then my final 
recommendation. Skip to that if you're in a hurry.

1. Create the model at the beginning on the first page of the form, and 
have each successive page update the model. Validations are tricky 

ryanb

# AR Object dup vs marshal benchmarks
#
# re: http://rails.lighthouseapp.com/projects/8994/tickets/785
#
#    user     system      total        real
#  string saved in hash  0.060000   0.000000   0.060000 (  0.051861)
#    string marshalling  0.630000   0.000000   0.630000 (  0.643304)
#
#  object saved in hash  0.060000   0.000000   0.060000 (  0.052789)
#    object marshalling  7.020000   0.030000   7.050000 (  7.073463)

ryanb

# single controller
map.with_options :controller => 'info' do |info|
  info.about 'info/about', :action => 'about'
  info.privacy 'legal/privacy', :action => 'privacy'
  info.license 'legal/license', :action => 'license'
end

# multiple controllers
map.about 'info/about', :controller => 'info', :action => 'about'
map.privacy 'legal/privacy', :controller => 'legal', :action => 'privacy'

ryanb

def show
  @category = Category.find_by_permalink(params[:category])
  @page = @category.pages.find_by_permalink(params[:page])
end

ryanb

# Examples of Nesting Associated Attributes
# This is a look at the various ways to set associated attributes through 
# nested parameters. For example, let's say Project has_many :tasks and 
# we want to update the tasks the same time we edit a project. There are 
# several ways this interface could be handled, and here are a few.
#
# For these examples, we're trying to create two new tasks and update an
# existing task (with id 3) through a project.

# Approach 1

ryanb

/*
  PROBLEM:
  >> h = Hello.new('hi!')
  => #<Hello:0x4b730>
  >> h.greet
  hi!=> nil
  >> h.greet
  hi!=> nil
  ..
  >> h.greet

ryanb

require 'rubygems'
require 'gosu'

class GameWindow < Gosu::Window
  def initialize
    super(640, 480, false)
    self.caption = "Ruby Warrior"
    @board = Board.new(self, 8, 1)
    @unit = Unit.new(self)
    @board.units << @unit

ryanb

class Tag
  has_many :taggings
  named_scope :important, :include => { :taggings => :important }
end

class Tagging
  belongs_to :tag
  belongs_to :posts
  
  # uses a string 'flag' column but could be changed to a boolean important 

ryanb

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