Cachekey Tagging

[krazyjakee]

Feature suggestion: A "tagging" mechanism which gives you the ability to "tag" cache keys and mass invalidate. For example, if I had a movie website and each movie had an overview, review and trailer page, I could del the movie tag like { movie: 1322 } and it would invalidate all 3 caches.

I believe this functionality is part of redis under the SADD and SMEMBER commands. My knowledge of redis is quite limitted.

Proposed router setup:

app.get('/index.html',
  cache.route({ tag: { movie: 1322 }  }),
  function (req, res)  { ... });

From inside the action:

function (req, res, next) {
    res.express_redis_cache_tag = { movie: 1322 };
    next();
    }

Using cache.get:

cache.get({ movie: 1322 }, function (error, entries) {}); // Note object, not string.

Finally cache.del:

cache.del({ movie: 1322 }, callback); // Deletes all associated keys