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

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

1 files changed, 7 insertions, 1 deletions

diff --git a/activesupport/lib/active_support/cache/mem_cache_store.rb b/activesupport/lib/active_support/cache/mem_cache_store.rb
index bfe7e2ccf3..b3769b812f 100644
--- a/activesupport/lib/active_support/cache/mem_cache_store.rb
+++ b/activesupport/lib/active_support/cache/mem_cache_store.rb
@@ -48,7 +48,13 @@ module ActiveSupport
       rescue MemCache::MemCacheError => e
         logger.error("MemCacheError (#{e}): #{e.message}")
         false
-      end              
+      end
+
+      def exist?(key, options = nil)
+        # Doesn't call super, cause exist? in memcache is in fact a read
+        # But who cares? Reading is very fast anyway
+        !read(key, options).nil?
+      end
 
       def increment(key, amount = 1)       
         log("incrementing", key, amount)