Question

I have a problem with doctrine. I like the caching, but if i update an Entity and flush, shouldn’t doctrine2 be able to clear it’s cache?
Otherwise the cache is of very little use to me since this project has a lot of interaction and i would literally always have to disable the cache for every query.
The users wouldn’t see their interaction if the cache would always show them the old, cached version.

Is there a way arround it?

Answer 1

This is according to the documentation on Doctrine2 on how to clear the cache. I’m not even sure this is what you want, but I guess it is something to try.

Doctrine2’s cache driver has different levels of deleting cached entries.

You can delete by the direct id, using a regex, by suffix, by prefix and plain deleting all values in the cache

So to delete all you’d do:

$deleted = $cacheDriver->deleteAll();

And to delete by prefix, you’d do:

$deleted = $cacheDriver->deleteByPrefix('users_');

I’m not sure how Doctrine2 names their cache ids though, so you’d have to dig for that.

Information on deleting cache is found here: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/caching.html#deleting

To get the cache driver, you can do the following. It wasn’t described in the docs, so I just traced through the code a little.

I’m assuming you have an entity manager instance in this example:

$config = $em->getConfiguration(); //Get an instance of the configuration
$queryCacheDriver = $config->getQueryCacheImpl(); //Gets Query Cache Driver
$metadataCacheDriver = $config->getMetadataCacheImpl(); //You probably don't need this one unless the schema changed

Alternatively, I guess you could save the cacheDriver instance in some kind of Registry class and retrieve it that way. But depends on your preference. Personally I try not to depend on Registries too much.

Another thing you can do is tell the query you’re executing to not use the result cache. Again I don’t think this is what you want, but just throwing it out there. Mainly it seems you might as well turn off the query cache altogether. That is unless it’s only a few specific queries where you don’t want to use the cache.

This example is from the docs: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/caching.html#result-cache

$query = $em->createQuery('select u from \Entities\User u');
$query->useResultCache(false); //Don't use query cache on this query
$results = $query->getResult();