# File lib/simple_form/form_builder.rb, line 336
    def lookup_model_names
      @lookup_model_names ||= begin
        child_index = options[:child_index]
        names = object_name.to_s.scan(/([a-zA-Z_]+)/).flatten
        names.delete(child_index) if child_index
        names.each { |name| name.gsub!('_attributes', '') }
        names.freeze
      end
    end