Merge branch 'CheckMateIO-bugfix/fix-fragment-cached-check'

Remaining issues:
- Changelog
- Test

Author: bf4

lib/active_model/serializer/adapter/cached_serializer.rb

@@ -24,7 +24,7 @@ def cached?
         end
 
         def fragment_cached?
-          @klass._cache_only && !@klass._cache_except || !@klass._cache_only && @klass._cache_except
+          @klass._cache && (@klass._cache_only && !@klass._cache_except || !@klass._cache_only && @klass._cache_except)
         end
 
         def cache_key