diff options
Diffstat (limited to 'actionpack/lib')
-rw-r--r-- | actionpack/lib/action_controller/caching/fragments.rb | 56 | ||||
-rw-r--r-- | actionpack/lib/action_view/helpers/cache_helper.rb | 22 |
2 files changed, 49 insertions, 29 deletions
diff --git a/actionpack/lib/action_controller/caching/fragments.rb b/actionpack/lib/action_controller/caching/fragments.rb index 37c155b9cd..88f973e62d 100644 --- a/actionpack/lib/action_controller/caching/fragments.rb +++ b/actionpack/lib/action_controller/caching/fragments.rb @@ -1,40 +1,59 @@ module ActionController #:nodoc: module Caching - # Fragment caching is used for caching various blocks within templates without caching the entire action as a whole. This is useful when - # certain elements of an action change frequently or depend on complicated state while other parts rarely change or can be shared amongst multiple - # parties. The caching is done using the cache helper available in the Action View. A template with caching might look something like: + # Fragment caching is used for caching various blocks within + # views without caching the entire action as a whole. This is + # useful when certain elements of an action change frequently or + # depend on complicated state while other parts rarely change or + # can be shared amongst multiple parties. The caching is done using + # the <tt>cache</tt> helper available in the Action View. A + # template with fragment caching might look like: # # <b>Hello <%= @name %></b> + # # <% cache do %> # All the topics in the system: # <%= render :partial => "topic", :collection => Topic.find(:all) %> # <% end %> # - # This cache will bind to the name of the action that called it, so if this code was part of the view for the topics/list action, you would - # be able to invalidate it using <tt>expire_fragment(:controller => "topics", :action => "list")</tt>. + # This cache will bind the name of the action that called it, so if + # this code was part of the view for the topics/list action, you + # would be able to invalidate it using: + # + # expire_fragment(:controller => "topics", :action => "list") # - # This default behavior is of limited use if you need to cache multiple fragments per action or if the action itself is cached using - # <tt>caches_action</tt>, so we also have the option to qualify the name of the cached fragment with something like: + # This default behavior is limited if you need to cache multiple + # fragments per action or if the action itself is cached using + # <tt>caches_action</tt>. To remedy this, there is an option to + # qualify the name of the cached fragment by using the + # <tt>:action_suffix</tt> option: # # <% cache(:action => "list", :action_suffix => "all_topics") do %> # - # That would result in a name such as <tt>/topics/list/all_topics</tt>, avoiding conflicts with the action cache and with any fragments that use a - # different suffix. Note that the URL doesn't have to really exist or be callable - the url_for system is just used to generate unique - # cache names that we can refer to when we need to expire the cache. + # That would result in a name such as + # <tt>/topics/list/all_topics</tt>, avoiding conflicts with the + # action cache and with any fragments that use a different suffix. + # Note that the URL doesn't have to really exist or be callable + # - the url_for system is just used to generate unique cache names + # that we can refer to when we need to expire the cache. # # The expiration call for this example is: # - # expire_fragment(:controller => "topics", :action => "list", :action_suffix => "all_topics") + # expire_fragment(:controller => "topics", + # :action => "list", + # :action_suffix => "all_topics") module Fragments - # Given a key (as described in <tt>expire_fragment</tt>), returns a key suitable for use in reading, - # writing, or expiring a cached fragment. If the key is a hash, the generated key is the return - # value of url_for on that hash (without the protocol). All keys are prefixed with <tt>views/</tt> and uses + # Given a key (as described in <tt>expire_fragment</tt>), returns + # a key suitable for use in reading, writing, or expiring a + # cached fragment. If the key is a hash, the generated key is the + # return value of url_for on that hash (without the protocol). + # All keys are prefixed with <tt>views/</tt> and uses # ActiveSupport::Cache.expand_cache_key for the expansion. def fragment_cache_key(key) ActiveSupport::Cache.expand_cache_key(key.is_a?(Hash) ? url_for(key).split("://").last : key, :views) end - # Writes <tt>content</tt> to the location signified by <tt>key</tt> (see <tt>expire_fragment</tt> for acceptable formats) + # Writes <tt>content</tt> to the location signified by + # <tt>key</tt> (see <tt>expire_fragment</tt> for acceptable formats). def write_fragment(key, content, options = nil) return content unless cache_configured? @@ -46,7 +65,8 @@ module ActionController #:nodoc: content end - # Reads a cached fragment from the location signified by <tt>key</tt> (see <tt>expire_fragment</tt> for acceptable formats) + # Reads a cached fragment from the location signified by <tt>key</tt> + # (see <tt>expire_fragment</tt> for acceptable formats). def read_fragment(key, options = nil) return unless cache_configured? @@ -57,7 +77,8 @@ module ActionController #:nodoc: end end - # Check if a cached fragment from the location signified by <tt>key</tt> exists (see <tt>expire_fragment</tt> for acceptable formats) + # Check if a cached fragment from the location signified by + # <tt>key</tt> exists (see <tt>expire_fragment</tt> for acceptable formats) def fragment_exist?(key, options = nil) return unless cache_configured? key = fragment_cache_key(key) @@ -70,6 +91,7 @@ module ActionController #:nodoc: # Removes fragments from the cache. # # +key+ can take one of three forms: + # # * String - This would normally take the form of a path, like # <tt>pages/45/notes</tt>. # * Hash - Treated as an implicit call to +url_for+, like diff --git a/actionpack/lib/action_view/helpers/cache_helper.rb b/actionpack/lib/action_view/helpers/cache_helper.rb index f544a9d147..30e6c078b1 100644 --- a/actionpack/lib/action_view/helpers/cache_helper.rb +++ b/actionpack/lib/action_view/helpers/cache_helper.rb @@ -2,31 +2,29 @@ module ActionView # = Action View Cache Helper module Helpers module CacheHelper - # This helper to exposes a method for caching of view fragments. - # See ActionController::Caching::Fragments for usage instructions. + # 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. # - # 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 news topics, static HTML fragments, and so on. - # This method takes a block that contains the content you wish - # to cache. See ActionController::Caching::Fragments for more - # information. + # See ActionController::Caching::Fragments for usage instructions. # # ==== Examples - # If you wanted to cache a navigation menu, you could do the - # following. + # If you want to cache a navigation menu, you can do following: # # <% cache do %> # <%= render :partial => "menu" %> # <% end %> # - # You can also cache static content... + # You can also cache static content: # # <% cache do %> # <p>Hello users! Welcome to our website!</p> # <% end %> # - # ...and static content mixed with RHTML content. + # Static content with embedded ruby content can be cached as + # well: # # <% cache do %> # Topics: |