I need to create a small hash of values that persists across requests in
Rails. I cannot store this information in the database or filesystem
and only want to do it in memory. I was looking for a simple solution
to implement this and read somewhere that memcache is pretty much
overkill. This app is only running on one server so putting in memory
should be just fine. I'm very new to rails and ruby and have attempted
to implement a class variable like @@cache in my controller and that
didn't work. I've also attempted to create a singleton class (include
Singleton) outside of the controller and that didn't work either.
Here is the singleton class that I created to cache the information.
Any help would be appreciated. Thanks.
This would work as long as you have a *single* app server. As soon as you
have two or more then they won't be able to share this information and you
have syncing problems... which I'm guessing from below is going to matter
to you (for a cached list of states say it wouldn't).
Memcache isn't hard to setup and does exactly what you want -- but keep in
mind it's not persistant (meaning if it fills up, it will remove old
Why can't you use the database or /tmp files?