Allows you to group validations and call them on save.

ValidationGroups
================
Lets your group validations

Example
=======
class Foo < ActiveRecord::Base
  validates_acceptance_of :bln, :accept => true, :allow_nil => false, :when => [:test1, :test]
  validates_length_of :str, :within => 1..21, :when => [:test2, :test]
  validates_length_of :int, :within => 1..21
end

>> f = Foo.new
=> #<Foo id: nil, str: nil, int: nil, bln: nil, created_at: nil, updated_at: nil>

When normal save is called .save all validations run normally.

>> f.save
=> false
>> f.errors.full_messages
=> ["Int is too short (minimum is 1 characters)", "Bln must be accepted", "Str is too short (minimum is 1 characters)"]

When save is called with a group only validations part of that group and validations with no groups run

>> f.save(:test1)
=> false
>> f.errors.full_messages
=> ["Int is too short (minimum is 1 characters)", "Bln must be accepted"]

>> f.save([:test, :test1])
=> false
>> f.errors.full_messages
=> ["Int is too short (minimum is 1 characters)", "Bln must be accepted", "Str is too short (minimum is 1 characters)"]

To-Do
=====
Add .valid? support. 
Refactor

Copyright (c) 2009 Kevin Patel, released under the MIT license