useSubscription hook has no subscribeToMore

[FluorescentHallucinogen]

See apollographql/apollo-client#8727.

@bennypowers Is it possible to fix/implement it in Apollo Elements before it will be fixed/implemented in Apollo Client?

[bennypowers]

Sounds like a nice feature. I'd be hesitant to implement this in Apollo elements, in case the API diverges from upstream at any point

As a workaround, have you considered using a query first and calling subscribeToMore on it? You could use a graphql fragment to reduce duplication between the query and subscription documents

[FluorescentHallucinogen]

As a workaround, have you considered using a query first and calling subscribeToMore on it? You could use a graphql fragment to reduce duplication between the query and subscription documents

The idea is to prevent exactly that, because Hasura subscriptions return the initial data (current state) once you subscribes. After that Hasura subscriptions return the new data (new state), not the patches (individual events).

[bennypowers]

🤔

If that's the case, could you write a typePolicy to handle the merge for you?

[FluorescentHallucinogen]

If that's the case, could you write a typePolicy to handle the merge for you?

relayStylePagination fits perfectly.

But the problem is that typePolicy works with queries and fetchMore, but don't work with subscriptions and subscribeToMore. See apollographql/apollo-client#7557 for more info. As you can see, that's point 2 in my issue apollographql/apollo-client#8727.

What about point 1 — adding subscribeToMore to useSubscription hook?

The point 2 (typePolicy), as a workaround, can be replaced by updateQuery function for subscribeToMore. This updateQuery function will be almost the same as relayStylePagination function.