Composite keys recommended?

[pke]

I wonder if composite keys are actually recommended or should mutation happen via useEffect?

const { data } = useSwr(["user", sessionId])
// vs
const { mutate } = useSwr("user")
useEffect(() => mutate(), [mutate, sessionId])

The issues with the first variant are:

1. data becomes undefined for a moment when sessionId changes
2. it retains multiple composite keys for "old" users associated with old sessionIds
3. makes it harder to mutate globally, since the key is dependent on the current sessionId

The second variant has none of the above mentioned drawbacks, but its more boilerplace code

What is recommended by the team at vercel? @shuding

[shuding]

Yeah this is a great question! For this specific use case, we use the second variant because "user" is a global singleton. And we also have an effect to revalidate when:

• sessionId changes
• logging out

Seems like a special case though, but good to have a section or example in the documentation. I'll note this down!