The following examples demonstrate how to delete documents, fields, and collections.
Read moreHow do I remove items from firestore?
In Firebase Firestore, for deleting a document, the delete() method is used:
Read moreHow do you delete a file from firestore using where clause?
You can only delete a document once you have a DocumentReference to it. To get that you must first execute the query, then loop over the QuerySnapshot and finally delete each DocumentSnapshot based on its ref .8 Kas 2017
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