Firebase firestore remove item from array of field

Question

I am using Firebase Firestore to make my website

As you can see, I have a field commentList and its type is array and now I want to remove the first item of the array This is what I did:

exports.delete__comment = (req, res, next) => {
  const {id} = req.params;
  const {comment} = req.body;

  return db
    .collection('instagram__posts')
    .doc(id)
    .update({
      commentList: FieldValue.arrayRemove(JSON.stringify(comment)),
    })
    .then((doc) => {
      console.log('comment deleted', comment);
      next();
    })
    .catch((err) => {
      res.status(500).json({err});
      console.log(err);
    });
};

if the item was deleted, I will console.log('comment deleted', comment); and it worked

but the sad thing is it does not remove in the database for me instead, it still there. Please show me how to fix it, thank you so much and Merry Chirstmas

try this: https://stackoverflow.com/questions/46984308/delete-field-in-firestore-document — Son Tran, Dec 25 '20 at 08:51
em muốn xóa cả item luôn anh ạ chứ không chỉ xóa mỗi field, em ghi rõ ra vậy cho dễ phân biệt thôi. Em xin cảm ơn anh — 16020278 Đỗ Đức Tâm, Dec 25 '20 at 10:54
It doesn't make sense to use `JSON.stringify()` here. Your array items are objects, not strings, so you should pass an object that fully matches the one to remove. — Doug Stevenson, Dec 25 '20 at 18:12

score 1 · Answer 1 · answered Dec 25 '20 at 08:54

1

I am not sure why you converted comment object to string using JSON.stringify.

Try to use comment instead of JSON.stringify(comment).

answered Dec 25 '20 at 08:54

michael

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Firebase firestore remove item from array of field

1 Answers1