# module ActionView::Helpers::CacheHelper

### Public Instance Methods

cache(name = {}, options = nil) { || ... } click to toggle source

This helper exposes a method for caching fragments of a view rather than an entire action or page. This technique is useful caching pieces like menus, lists of newstopics, static HTML fragments, and so on. This method takes a block that contains the content you wish to cache.

See ActionController::Caching::Fragments for usage instructions.

#### Examples¶ ↑

If you want to cache a navigation menu, you can do following:

    <% cache do %>
      <%= render :partial => "menu" %>
    <% end %>

You can also cache static content:

    <% cache do %>
       <p>Hello users!  Welcome to our website!</p>
    <% end %>

Static content with embedded ruby content can be cached as well:

    <% cache do %>
      Topics:
      <%= render :partial => "topics", :collection => @topic_list %>
      <i>Topics listed alphabetically</i>
    <% end %>

    # File lib/action_view/helpers/cache_helper.rb, line 34
    def cache(name = {}, options = nil, &block)
      if controller.perform_caching
        safe_concat(fragment_for(name, options, &block))
      else
        yield
      end

      nil
    end