update subscription

-import React from "react";
+import React, { useEffect, useState } from "react";
 import { useMutation, useQuery } from "@apollo/react-hooks";
 import { useMutation, useQuery } from "@apollo/react-hooks";
 import ChatPresenter from "./ChatPresenter";
 import ChatPresenter from "./ChatPresenter";
 import { withRouter } from "react-router-dom";
 import { withRouter } from "react-router-dom";
@@ -12,6 +12,7 @@ import useInput from "../../Hooks/useInput";
 import { toast } from "react-toastify";
 import { toast } from "react-toastify";
 
 
 export default withRouter(({ location }) => {
 export default withRouter(({ location }) => {
+  const [messageArr, setMessageArr] = useState([]);
   const { pathname } = location;
   const { pathname } = location;
   const roomName = pathname.slice(1, pathname.length);
   const roomName = pathname.slice(1, pathname.length);
   const [createMsg] = useMutation(CREATE_MESSAGE);
   const [createMsg] = useMutation(CREATE_MESSAGE);
@@ -30,7 +31,12 @@ export default withRouter(({ location }) => {
     roomNum = Number(roomId);
     roomNum = Number(roomId);
   }
   }
 
 
-  const { subscribeToMore, data: messageList } = useQuery(SEE_ALL_MESSAGE, {
+  const {
+    subscribeToMore,
+    data: messageList,
+    error: msgQueryError,
+    loading: msgQueryyLoading,
+  } = useQuery(SEE_ALL_MESSAGE, {
     variables: { roomId: roomNum },
     variables: { roomId: roomNum },
   });
   });
 
 
@@ -43,12 +49,27 @@ export default withRouter(({ location }) => {
     messageArray = messageList;
     messageArray = messageList;
   }
   }
 
 
-  let resultObj = subscribeToMore({
-    document: SUBSCRIPTION_MSG,
-    updateQuery: (prev, { subscriptionData }) => {
-      if (!subscriptionData.data) return prev;
-    },
-  });
+  useEffect(() => {
+    if (msgQueryError) {
+      console.error(msgQueryError);
+    }
+    if (messageArr) {
+      setMessageArr(messageArr.seeAllMessage);
+    }
+  }, [msgQueryyLoading]);
+
+  const subscribeToNewMessage = () => {
+    subscribeToMore({
+      document: SUBSCRIPTION_MSG,
+      updateQuery: (currentMessages, { subscriptionData }) => {
+        if (!subscriptionData.data) return currentMessages;
+        const newMessage = subscriptionData.data.subMessage;
+        const updateMessages = currentMessages.seeAllMessage.concat(newMessage);
+        setMessageArr(updateMessages);
+        return { seeAllMessage: updateMessages };
+      },
+    });
+  };
 
 
   const onSubmit = async (e) => {
   const onSubmit = async (e) => {
     e.preventDefault();
     e.preventDefault();
@@ -75,6 +96,7 @@ export default withRouter(({ location }) => {
       message={message}
       message={message}
       onSubmit={onSubmit}
       onSubmit={onSubmit}
       messageArray={messageArray}
       messageArray={messageArray}
+      subscribeToNewMessage={subscribeToNewMessage}
     />
     />
   );
   );
 });
 });