message: twisted_rightwards_arrows: Fix merge conflict in unit
diff: @@ -67,7 +67,7 @@ const unitSchema = new mongoose.Schema({
  if (ret._course) {
  ret._course = ret._course.toString();
  }
  - ret._course = ret._course.toString();
  +
  if (ret.hasOwnProperty('chatRoom') && ret.chatRoom) {
  ret.chatRoom = ret.chatRoom.toString();
  }
  