hamlの書き方

だめ

- form_for @search_form, url: books_path, html: {method: :get} do |f| 
  %p
    = f.search_field :q 
    = f.submit 'Search'

OK

= form_for :search, :url => books_path, :html => {:method => :get} do |f|
  = f.text_field :keyword
  = f.submit "Search", :class => "button submit"