Examples for mutations, queryClient?

[fholmqvist]

Would it be possible to pad out the examples with mutations and their callbacks? I've been wrestling ReactQuery.useMutation({onSuccess: ...}) with queryClient (getQueryData, setQueryData etc) but failing to wrap my head around it.

QueryClient is listed as work in progress, but current version is 1.1.0. Can it be used?

[vmarcosp]

Hey @Holmqvist1990 👋
Could you elaborate about your need? I'm not working on this repo actively, but I have plans to finish the support for the missing bindings.

[fholmqvist]

Hey @vmarcosp, thanks for the reply! 👋

The README demonstrates:

let queryResult = ReactQuery.useQuery({
      queryFn: fetchTodos,
      queryKey: ["todos"],
      /*
       * Helper functions to convert unsupported TypeScript types in ReScript
       * Check out the module ReactQuery_Utils.res
       */
      refetchOnWindowFocus: ReactQuery.refetchOnWindowFocus(#bool(false)),
    })

Perhaps it could also demonstrate something like:

let queryClient = ReactQuery.useQueryClient()

let addTodoMutation = ReactQuery.useMutation({
    mutationFn: addTodo,
    mutationKey: ["todos"],
    onSuccess: (todo: todo) => {
        queryClient.setQueryData(["todos"], (oldTodos) => Js.Array2.append(oldTodos, todo))
    
        // or
    
        let todos: array<todo> = queryClient.getQueryData(["todos"])->Option.getWithDefault([])
        todos->Array.push(todo)
        queryClient.setQueryData(["todos"], Some(todos))
    }
})

(note: above examples don't compile)

[vmarcosp]

What error are you getting with this code? setQueryData is typed as ('queryKey, option<'queryData>) => unit which assumes the use as setQueryData(["todos"], newTodo), it's possible to support setQueryData as ('queryKey, option<'queryData> => queryData as well (using the updater function) but I think you can still do the same since you can get the same value by doing queryClient.getQueryData with the same queryKey.