def initialize(object_name, object, template, options, proc)
@nested_child_index = {}
@object_name, @object, @template, @options, @proc = object_name, object, template, options, proc
@parent_builder = options[:parent_builder]
@default_options = @options ? @options.slice(:index, :namespace) : {}
if @object_name.to_s.match(/\[\]$/)
if object ||= @template.instance_variable_get("@#{Regexp.last_match.pre_match}") and object.respond_to?(:to_param)
@auto_index = object.to_param
else
raise ArgumentError, "object[] naming but object param and @object var don't exist or don't respond to to_param: #{object.inspect}"
end
end
@multipart = nil
end