typegraphql - How to filter type-graphql subscription using context, instead of args?

Question

I am trying to send notification to different users and want every user to see only his. I have already succeeded to do you with @Args.

Heres the subscribtion:

@Subscription(() => Notification, {
    topics: "NOTIFICATIONS",
    filter: ({ payload, args }: ResolverFilterData<Notification, NewNotificationArgs>) => {
        return payload.userId === args.userId;
    },
})
newNotification(
    @Root() notification: Notification,
    @Args() { userId }: NewRequestArgs
): Notification {
   return notification;
}

And the mutation:

@Mutation(() => Boolean)
async createNotification(
    @PubSub("NOTIFICATIONS") notifyAboutNewNotification: Publisher<Notification>
): Promise<Boolean> {
    const notification = await Notification.create({
        userId: <some id>,
        message: <some message>
    }).save();

    await notifyAboutNewRequest(notification);

    return true;
}

Now I want you use a userId, that I have stored in the context.req.session.userId as a cookie.

question from:https://stackoverflow.com/questions/65834157/how-to-filter-type-graphql-subscription-using-context-instead-of-args

Answer 1

ResolverFilterData contains payload, args, context and info. So you can access that by filter: ({ context }) => { ... }.