# Kind of messy, but idea is to be able to sanely retrive params
  # with a default, this could be expanded to multi-level params too
  # although I think that, in general, those would require more special-cases.
  # Note: +default+ will be converted to a string; it should be symmetrical
  #   with the conversion method
  #
  # While this is extremely helpful for things such as seach forms it
  # seems much less useful dealing with crud operations when Models
  # or AR operations based on an id are used as these are already
  # appropriately handle conversions.
  #
  class SelectParams
    def initialize(source)
      @source = source
      @used = HashWithIndifferentAccess.new
    end
    def get(name, default='', conversion=nil)
      @used[name] = true
      raw_value = @source[name]
      value = raw_value.nil? || raw_value.empty? ? default.to_s : raw_value
      conversion ? value.send(conversion) : value
    end
    # Delete params which have not been retrieved with #get. Useful if the params
    # are going to be directly passed (such as a paginators "next page" link)
    def delete_unused!
      @source.delete_if {|k, v| not @used.include? k}
    end
    def delete(*names)
      names.each {|name| @source.delete name}
    end
  end

  def select_params(source=params)
    p = SelectParams.new(source)
    yield p
    p
  end


    select_params do |p|
      @advanced = p.get :advanced, false, :to_bool
      @search   = p.get :search
      if @advanced
	@min_length = p.get :min_length, 0, :to_i
	@max_length = p.get :max_length, 0, :to_i
	@offensive  = p.get :include_offensive, false, :to_bool
	@random     = p.get :random, false, :to_bool
	@per_page   = p.get :per_page, 10, :to_i
      else
	@per_page = 10
      end
      @page = p.get :page, 1, :to_i
      p.delete :commit
      p.delete_unused!
    end