Add fragment_exist? and exist? methods to cache stores. [#203 state:resolved]

Signed-off-by: Pratik Naik <pratiknaik@gmail.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/actionpack/lib/action_controller/caching/fragments.rb b/actionpack/lib/action_controller/caching/fragments.rb
index e4d8678a07..e4f5de44ab 100644
--- a/actionpack/lib/action_controller/caching/fragments.rb
+++ b/actionpack/lib/action_controller/caching/fragments.rb
@@ -98,6 +98,17 @@ 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)
+      def fragment_exist?(key, options = nil)
+        return unless cache_configured?
+
+        key = fragment_cache_key(key)
+
+        self.class.benchmark "Cached fragment exists?: #{key}" do
+          cache_store.exist?(key, options)
+        end
+      end
+
       # Name can take one of three forms:
       # * String: This would normally take the form of a path like "pages/45/notes"
       # * Hash: Is treated as an implicit call to url_for, like { :controller => "pages", :action => "notes", :id => 45 }
@@ -124,4 +135,4 @@ module ActionController #:nodoc:
       end
     end
   end
-end
\ No newline at end of file
+end