module StrictlyUntyped
  module ConditionsScope
    # Makes it easy to add scopes which are only conditions.
    # 
    # For example, 
    #  class Person < ActiveRecord::Base
    #    named_scope :active, :conditions => {:active => true}
    #  end
    # 
    # Can be replaced with
    #   named_conditions :active, :active => true
    # 
    # 
    # Also,
    #   Person.scoped(:conditions => {:active => true})
    # 
    # Can be replaced with
    #   Person.conditions :active => true
    # 
    def self.included(base)
      base.class_eval do
        extend ClassMethods
        named_conditions :conditions, lambda { |conditions| conditions }
      end
    end
    
    module ClassMethods
      def named_conditions(name, conditions, &block)
        named_scope(name, case conditions
            when Hash
              {:conditions => conditions}
            when Proc
              lambda { |*args| {:conditions => conditions.call(*args)} }
          end, &block)
      end
    end
  end
end