Search using GET request

Filter params will be passed by GET http request. URL would be like:

/products/?filter_cmd=apply&filter[title]=sometext&filter[category]=4

example:

  search_filter :index, {url: :products_path} do
    default_order "price", 'asc'

    field :title, :string, :text, {label: 'Title', default_value: '', condition: :like_full}
  end