add context subscription

src/Message/message.schema.ts

@@ -109,7 +109,10 @@ export class MessageSchema extends PothosSchema {
             ...query,
             data: args.input,
           });
-          ctx.pubSub.publish('MESSAGE_SENT', message);
+          if (ctx.isSubscription) {
+            throw new Error('Not allowed');
+          }
+          ctx.http.pubSub.publish('MESSAGE_SENT', message);
           return message;
         },
       }),
@@ -124,9 +127,12 @@ export class MessageSchema extends PothosSchema {
     this.builder.subscriptionFields((t) => ({
       messageSent: t.field({
         subscribe: (_, __, ctx) => {
+          if (!ctx.isSubscription) {
+            throw new Error('Not allowed');
+          }
           return {
             [Symbol.asyncIterator]: () =>
-              ctx.pubSub.asyncIterator('MESSAGE_SENT'),
+              ctx.websocket.pubSub.asyncIterator('MESSAGE_SENT'),
           };
         },
         type: this.message(), // Add the type property