module Ransack::Helpers::FormHelper

def search_form_for(record, options = {}, &proc)
  if record.is_a? Ransack::Search
    search = record
    options[:url] ||= polymorphic_path(
      search.klass, format: options.delete(:format)
      )
  elsif record.is_a?(Array) &&
  (search = record.detect { |o| o.is_a?(Ransack::Search) })
    options[:url] ||= polymorphic_path(
      options_for(record), format: options.delete(:format)
      )
  else
    raise ArgumentError,
    'No Ransack::Search object was provided to search_form_for!'
  end
  options[:html] ||= {}
  html_options = {
    class:  html_option_for(options[:class], search),
    id:     html_option_for(options[:id], search),
    method: :get
  }
  options[:as] ||= Ransack.options[:search_key]
  options[:html].reverse_merge!(html_options)
  options[:builder] ||= FormBuilder
  form_for(record, options, &proc)
end