module Groupdate
  module Scopes

    Groupdate::FIELDS.each do |field|
      define_method :"group_by_#{field}" do |*args|
        args = args.dup
        options = args[-1].is_a?(Hash) ? args.pop : {}
        options[:time_zone] ||= args[1] unless args[1].nil?
        options[:range] ||= args[2] unless args[2].nil?

        Groupdate::Magic.new(field, options).relation(args[0], self)
      end
    end

  end
end