diff options
Diffstat (limited to 'actionview/lib/action_view/helpers/cache_helper.rb')
| -rw-r--r-- | actionview/lib/action_view/helpers/cache_helper.rb | 34 |
1 files changed, 25 insertions, 9 deletions
diff --git a/actionview/lib/action_view/helpers/cache_helper.rb b/actionview/lib/action_view/helpers/cache_helper.rb index 4eaaa239e2..5258a01144 100644 --- a/actionview/lib/action_view/helpers/cache_helper.rb +++ b/actionview/lib/action_view/helpers/cache_helper.rb @@ -69,11 +69,11 @@ module ActionView # render 'comments/comments' # render('comments/comments') # - # render "header" => render("comments/header") + # render "header" translates to render("comments/header") # - # render(@topic) => render("topics/topic") - # render(topics) => render("topics/topic") - # render(message.topics) => render("topics/topic") + # render(@topic) translates to render("topics/topic") + # render(topics) translates to render("topics/topic") + # render(message.topics) translates to render("topics/topic") # # It's not possible to derive all render calls like that, though. # Here are a few examples of things that can't be derived: @@ -130,9 +130,10 @@ module ActionView # # When rendering a collection of objects that each use the same partial, a `cached` # option can be passed. + # # For collections rendered such: # - # <%= render partial: 'notifications/notification', collection: @notifications, cached: true %> + # <%= render partial: 'projects/project', collection: @projects, cached: true %> # # The `cached: true` will make Action View's rendering read several templates # from cache at once instead of one call per template. @@ -142,13 +143,21 @@ module ActionView # Works great alongside individual template fragment caching. # For instance if the template the collection renders is cached like: # - # # notifications/_notification.html.erb - # <% cache notification do %> + # # projects/_project.html.erb + # <% cache project do %> # <%# ... %> # <% end %> # # Any collection renders will find those cached templates when attempting # to read multiple templates at once. + # + # If your collection cache depends on multiple sources (try to avoid this to keep things simple), + # you can name all these dependencies as part of a block that returns an array: + # + # <%= render partial: 'projects/project', collection: @projects, cached: -> project { [ project, current_user ] } %> + # + # This will include both records as part of the cache key and updating either of them will + # expire the cache. def cache(name = {}, options = {}, &block) if controller.respond_to?(:perform_caching) && controller.perform_caching name_options = options.slice(:skip_digest, :virtual_path) @@ -202,6 +211,8 @@ module ActionView end end + attr_reader :cache_hit # :nodoc: + private def fragment_name_with_digest(name, virtual_path) #:nodoc: @@ -215,9 +226,14 @@ module ActionView end end - # TODO: Create an object that has caching read/write on it def fragment_for(name = {}, options = nil, &block) #:nodoc: - read_fragment_for(name, options) || write_fragment_for(name, options, &block) + if content = read_fragment_for(name, options) + @cache_hit = true + content + else + @cache_hit = false + write_fragment_for(name, options, &block) + end end def read_fragment_for(name, options) #:nodoc: |