packlate_pms_integration options for selectively enabling validations.

pms_integration_test.rb

require 'rubygems'
require 'active_model'

class Test
  include ActiveModel::Validations

  def initialize(attributes = {})
    attributes.each do |name, value|
      send("#{name}=", value)
    end
  end

  attr_accessor :jeff

  # options:
  # 1. validates_presence_of :jeff, :unless => Proc.new { |t| t.exclude_validation?(:jeff_not_nil) }
  validates_presence_of :jeff, :unless => "exclude_validation?(:jeff_not_nil)"

  def persisted?
    false
  end

  def exclude_validation?(name)
    return false unless defined?(excluded_validations)
    excluded_validations.include?(name)
  end
end

# Define these in the gem, and let the gem be responsible for using them where desired.
module ValidationExclusions
  def excluded_validations
    [:jeff_not_nil]
  end
end

# What I don't really like about this, is that you have to set the excluded_validations on a per instance level.  I don't want there to be danger of having different gems overwrite one anothers validation exclusions though.  I think it'd be ok if there was just a good way of enforcing things transparently from the gem itself.  This seemslike it'd be a good place to use extend, right?