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.each do |attribute, opts|
      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])
      filter_opts = opts.except(:if, :unless)
      filter_opts[:input_html] = instance_exec(&filter_opts[:input_html]) if filter_opts[:input_html].is_a?(Proc)
      f.filter attribute, filter_opts
    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: except_hidden_fields)
    end
    f.template.concat buttons
  end
end

def except_hidden_fields
  [:q, :page]
end