def fields_for(record_or_name_or_array, *args, &block)
raise ArgumentError, "Missing block" unless block_given?
options = args.extract_options!
case record_or_name_or_array
when String, Symbol
object_name = record_or_name_or_array
object = args.first
else
object = record_or_name_or_array
object_name = ActiveModel::Naming.singular(object)
end
builder = options[:builder] || ActionView::Base.default_form_builder
builder = builder.new(object_name, object, self, options, block)
output = capture(builder, &block)
output.concat builder.hidden_field(:id) if output && options[:hidden_field_id] && !builder.emitted_hidden_id?
output
end