Automate subscriptions with links about apollo HOT 4 OPEN

  Subscription: {
    groups: {
      resolve: (payload, args, {db}) => {
        if (payload.event === Event.ADDED) {
          // do a direct grapher query to get the linked data
          let linkedDoc = db.groups.createQuery({
            $filters: {
              _id: payload.doc._id
            },
            _id: 1,
            name: 1,
            description: 1,
            members: {
              _id: 1,
              name: 1,
              company: 1
            },
            admins: {
              _id: 1,
              name: 1,
              company: 1
            }
          }).fetch();
          if (linkedDoc && linkedDoc.length) {
            // there should be only one record since we filtered on the added doc
            return ({
              doc: linkedDoc[0],
              event: payload.event
            });
          }
          // something went wrong, send back original payload
          return (payload);
        }
        return (payload);
      },
      subscribe(_, args, context) {
        console.log("Calling groups subscription; user = " + context.userId);

        // sanity checks
        if (!context.userId) {
          throw new Meteor.Error("authorization-error", "Action not authorized");
        }

        const observer = context.db.groups.find({
          memberIds: context.userId
        });

        return asyncIterator(observer);
      }
    }
  },
...