Question

I have a Haskell record data type that looks like this:

data Client = Client { clientId :: Int
                     , nickname :: Text
                     , clientSink :: Maybe (WS.Sink WS.Hybi00)
                     , clientRoom :: Maybe Room
                     }

I can’t derive a Show instance from this because of WS.Sink has no Show instance.

How can I make a Show instance that excludes just the clientSink field, but prints the rest of the record fields like a normal record?

Should I just create a custom Show instance for WS.Sink?

Answer 1

Add a Show instance for WS.Sink

instance Show WS.Sink where show a = "Sink"

or whatever dummy value you want.