module ActiveAdmin::Filters::ViewHelper

def active_admin_filters_form_for(search, filters, options = {})
  defaults = { :builder => ActiveAdmin::Filters::FormBuilder,
               :url     => collection_path,
               :html    => {:class  => 'filter_form'} }
  required = { :html    => {:method => :get},
               :as      => :q }
  options  = defaults.deep_merge(options).deep_merge(required)
  form_for search, options do |f|
    filters.group_by{ |o| o[:attribute] }.each do |attribute, array|
      opts     = array.last # grab last-defined `filter` call from DSL
      next if opts.key?(:if)     && !call_method_or_proc_on(self, opts[:if])
      next if opts.key?(:unless) &&  call_method_or_proc_on(self, opts[:unless])
      f.filter attribute, opts.except(:if, :unless)
    end
    buttons = content_tag :div, :class => "buttons" do
      f.submit(I18n.t('active_admin.filters.buttons.filter')) +
        link_to(I18n.t('active_admin.filters.buttons.clear'), '#', :class => 'clear_filters_btn') +
        hidden_field_tags_for(params, :except => [:q, :page])
    end
    f.form_buffers.last + buttons
  end
end