How to add object to a nested array in mongoDB and nodeJS

Question

I have no clue how can I push an object to a nested array

this is the Board document:

{
    "boardMembers": [
        "5f636a5c0d6fa84be48cc19d"
    ],
    "boardLists": [
        {
            "cards": [],
            "_id": "5f6387e077beba2e3c15d15a",
            "title": "list one",
            "__v": 0
        }
    ],
    "_id": "5f63877177beba2e3c15d159",
    "boardName": "board1",
    "boardPassword": "123456",
    "boardCreator": "5f636a5c0d6fa84be48cc19d",
    "g_createdAt": "2020-09-17T15:57:37.616Z",
    "__v": 2
}

I need to push a task inside the cards array (to a specific list with ID)

here is the code:

outer.post("/add-task/:id", auth, boardAuth, async (req, res) => {
  const listId = req.params.id;

 
    const board = await Board.findOne({ _id: req.board._id });
    if (!board) return res.status(404).send("no such board");

    const list = await List.findOne({ _id: listId });
    if (!list) return res.status(404).send("List not found");

    const task = new Task({
      text: req.body.text,
    });

    board.boardLists.map((list) => {
      if (listId.toString() === list._id.toString()) {
        list.cards.push(task);
      } else {
        console.log("no task");
      }
    });

    await board.save();
    res.send(board);
});

now the problem is when I make the request in postman its shows me the task inside the cards array i want but its not saving it to the mongoDB

Anuj Pancholi · Accepted Answer · 2020-09-18 14:10:07Z

2

You're using array.map() but:

Nothing is returned in the callback of map(), which will return an array with each element undefined;
You aren't assigning the array returned by map() to anything.

So, you can use array.map() to return an array in which the task is pushed to the desired list in board.boardLists like so:

board.boardLists = board.boardLists.map((list) => {
  if (listId.toString() === list._id.toString()) {
    return {
      ...list,
      cards: list.cards.concat(task)
    }
  } else {
    return list
  }
});

edited Sep 18, 2020 at 14:10

Anuj Pancholi

1,22311 silver badges13 bronze badges

answered Sep 18, 2020 at 12:20

Guilhermevrs

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1 Comment

Anuj Pancholi Over a year ago

just add a " , " after ...list and try

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