# File lib/action_view/helpers/form_helper.rb, line 123 def form_for(object_name, *args, &proc) raise ArgumentError, "Missing block" unless block_given? options = args.last.is_a?(Hash) ? args.pop : {} concat(form_tag(options.delete(:url) || {}, options.delete(:html) || {}), proc.binding) fields_for(object_name, *(args << options), &proc) concat('</form>', proc.binding) end