Re: [Haskell-cafe] Harder than you'd think

What I ended up writing is this: http://www.hpaste.org/fastcgi/hpaste.fcgi/view?id=25782 lookup :: KeyID -> Key -> Container -> Maybe Value

Does anybody have a less-insane way of doing this?

Sure: type MyMap = Map (KeyID, Key) Value Don't use multiple keys. Put the keys into a tuple and use that as key. Let me know whether this is what you were looking for. I tried writing something like this. Yet SQL gives all this stiff for free. I still wonder which is the nicest way to express this data in Haskell without coding everything yourself.. Yours Marc Weber