add unreadCount property

backend/src/graphql/rooms.ts

@@ -8,6 +8,7 @@ export const createRoomMutation = () => {
         roomId
         roomName
         lastMessageAt
+        unreadCount
         users {
           _id
           id
@@ -29,6 +30,7 @@ export const roomQuery = () => {
         roomId
         roomName
         lastMessageAt
+        unreadCount
         lastMessage {
           _id
           id

backend/src/schema/resolvers/rooms.spec.ts

@@ -126,6 +126,7 @@ describe('Room', () => {
                 id: expect.any(String),
                 roomId: result.data.CreateRoom.id,
                 roomName: 'Other Chatting User',
+                unreadCount: 0,
                 users: expect.arrayContaining([
                   {
                     _id: 'chatting-user',
@@ -241,6 +242,7 @@ describe('Room', () => {
                   id: expect.any(String),
                   roomId: result.data.Room[0].id,
                   roomName: 'Chatting User',
+                  unreadCount: 0,
                   users: expect.arrayContaining([
                     {
                       _id: 'chatting-user',

backend/src/schema/resolvers/rooms.ts

@@ -34,7 +34,8 @@ export default {
           RETURN room {
             .*,
             users: [properties(currentUser), properties(user)],
-            roomName: roomName
+            roomName: roomName,
+            unreadCount: toString(0)
           }
         `
         const createRommTxResponse = await transaction.run(createRoomCypher, {

backend/src/schema/types/type/Room.gql

@@ -23,6 +23,13 @@ type Room {
     WITH message ORDER BY message.createdAt DESC LIMIT 1
     RETURN message
   """)
+
+  unreadCount: Int @cypher(statement: """
+    MATCH (this)<-[:INSIDE]-(message:Message)<-[:CREATED]-(user:User)
+    WHERE NOT user.id = $cypherParams.currentUserId
+      AND NOT message.seen 
+    RETURN count(message)
+  """)
 }
 
 type Mutation {