How to delete a document that has a subdocument in firestore database?

Question

Here is the collection structure

I would like to delete the document doc("3F0SezA3")

I tried these below but none had work, i am getting console.log('deleted') but in the database the document is still showing

firebase.firestore()
    .collection("users")
    .doc("3F0SezA3").delete()
    .then(function () {
                console.log('deleted');
              }, function (error) {
                console.error('Delete Error', error);
              });

 firebase.firestore()
.collection("users").doc("3F0SezA3")
.collection("movives").doc("asdrftgyqweAsdghj120a").delete()
.then(function () {
                console.log('deleted');
              }, function (error) {
                console.error('Delete Error', error);
              });

What are are you seeing that suggests the document is not deleted? Did you check for errors on each delete? Please edit the question to explain in more detail. — Doug Stevenson
– Doug Stevenson, Commented Jun 14, 2020 at 5:21
Your code doesn't show any error handling being done with the promises returned by delete(). — Doug Stevenson
– Doug Stevenson, Commented Jun 14, 2020 at 6:16
What do you exactly mean by "How to delete a document that has a subdocument in firestore database?" You want to select the subdocument and delete the parent? OR, you want to delete the parent and THEN delete the subdocument? — Renaud Tarnec
– Renaud Tarnec, Commented Jun 14, 2020 at 17:01

Renaud Tarnec · Accepted Answer · 2020-06-14 20:10:28Z

2

If you want to delete the two documents at the same time, the best is to use a batched write, as follows:

var batch = firebase.firestore().batch();

var parentRef = firebase.firestore()
    .collection("users")
    .doc("3F0SezA3");
batch.delete(parentRef);

var childRef = parentRef
    .collection("movives")
    .doc("asdrftgyqweAsdghj120a");
batch.delete(childRef);

batch.commit()
.then(function () {
    console.log("Docs deleted")
})
.catch(function (error) {
    console.log(error)
});

answered Jun 14, 2020 at 20:10

Renaud Tarnec

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7 Comments

manny Over a year ago

hi @RenaudTarnec how can i delete this part firebase.firestore().collection("matches").doc("3F0SezA3"); alone, i tried this

firebase.firestore().collection("matches").doc("3F0SezA3").delete()             .then(function () {                 console.log("Docs deleted")             })             .catch(function (error) {                 console.log(error)             });

but it is not working

Renaud Tarnec Over a year ago

Hi, what you tried should normally work. Do you get any error.

manny Over a year ago

ok what i am trying to get at is how to delete a document with aboout over 100 sub document, the sub documents all have dynamic ids @RenaudTarnec

Renaud Tarnec Over a year ago

Since queries in Firestore are shallow, you need to query all the sub-documents in the sub-collection of this Document and delete them. See also this: firebase.google.com/docs/firestore/solutions/delete-collections

manny Over a year ago

thanks, could you please show me what path i would have to use function deleteAtPath(path) {} to initiate the server-side delete @RenaudTarnec

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