You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: abstract_form_builder.rb
    path of file: ./repos/padrino-framework/padrino-helpers/lib/padrino-helpers/form_builder
    
    the code of the file until where you have to start completion: module Padrino
  module Helpers
    module FormBuilder
      # Base class for Padrino Form Builder
      class AbstractFormBuilder
        attr_accessor :template, :object, :multipart
        attr_reader :namespace, :is_nested, :parent_form, :nested_index, :attributes_name, :model_name

     
    
        def labeled_group(field, options={})
          options = { :id => field_id(field), :selected => field_value(field) }.update(options)
          options.update(error_class(field)){ |_,*values| values.compact.join(' ') }
          selected_values = resolve_checked_values(field, options)
          variants_for_group(options).inject(SafeBuffer.new) do |html, (caption,value)|
            variant_id = "#{options[:id]}_#{value}"
            attributes = { :value => value, :id => variant_id, :checked => selected_values.include?(value) }
            caption = yield(attributes) << ' ' << caption
            html << @template.label_tag("#{field_name(field)}[]", :for => variant_id, :caption => caption)
          end
        end