Delete a field from Firestore, with a dynamic key
Solution 1
I have managed to delete a field like this:
let userId = "this-is-my-user-id"
let groupId = "this-is-my-group-id"
db.collection('groups').doc(groupId).update({
['members.' + userId]: firebase.firestore.FieldValue.delete()
})
This is using the dot operator method described here
Please let me know if there are any alternative methods to this
Thanks
Solution 2
I had to import FieldValue
https://firebase.google.com/docs/firestore/manage-data/delete-data#fields
// Get the `FieldValue` object
var FieldValue = require('firebase-admin').firestore.FieldValue;
// Create a document reference
var cityRef = db.collection('cities').doc('BJ');
// Remove the 'capital' field from the document
var removeCapital = cityRef.update({
capital: FieldValue.delete()
});
Finlay Percy
Javascript and Firebase Developer at Folded Group. BSc Audio Technology Graduate from Bournemouth University
Updated on June 17, 2022Comments
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Finlay Percy about 2 years
I am trying to delete a single field from a Document in Firestore The Key of the field is held in a variable e.g.
var userId = "random-id-1"
In the document I have a field of members structured like this:
{ members:{ random-id-1:true, random-id-2:true } }
I would like to delete
random-id-1:true
, but keeprandom-id-2:true
How is this possible without getting the entire members object and writing an updated object?
I have tried this, however I get the error:
Document references must have an even number of segments
and I also tried this:
db.collection('groups').doc(this.props.groupId).set({ members: { [userId]: firebase.firestore.FieldValue.delete() } },{merge: true})
However I get the error:
Function DocumentReference.update() called with invalid data. FieldValue.delete() can only appear at the top level of your update data
Thanks for any help
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ggDeGreat about 5 yearswhat happen if we try to remove field that doesn't existed in the document?
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ggDeGreat about 5 yearswhat happen if we try to remove field that doesn't existed in the document?