I am trying to subscribe to a graphql-yoga subscription using apollo-client useSubscription hook
import React from 'react';
import {useSubscription,gql} from '@apollo/client';
const SUB_NEW_MSG = gql`
subscription SUB_NEW_MSG($chatRoom:ID!)
{
newMessage(chatRoom:$chatRoom)
}`;
function NewMsg(){
const { loading,error,data } = useSubscription(SUB_NEW_MSG,{
variables:{
chatRoom: "608851227be4796a8463607a",
},
});
if(loading) return <p>loading...</p>;
if(error) return <p>{error}</p>;
console.log(data);
return <h4>New Message:{data.newMessage}</h4>;
}
But gives an error- Error: Objects are not valid as a React child (found: Error: Variable "$chatRoom" of required type "ID!" was not provided.). If you meant to render a collection of children, use an array instead.
The schema at the backend is
type Subscription{
newMessage(chatRoom: ID!): String!
}
resolver is
const { pubsub } = require("../helper");
const { withFilter } = require("graphql-yoga");
module.exports = {
Subscription: {
newMessage: {
subscribe: withFilter(
() => pubsub.asyncIterator("newMessage"),
(payload, variables) => {
console.log(payload.query, variables, "HALO");
return payload.chatRoom === variables.chatRoom;
}
),
},
},
};
But when I pass the query like below,with no variables to useSubscription hook.Then it works
const SUB_NEW_MSG = gql`
subscription SUB_NEW_MSG
{
newMessage(chatRoom:"608851227be4796a8463607a")
}`;
What should I do?Are there any workarounds?
Change your query to this, and test it.