java - Firestore 根据条件执行删除

Question

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Answer 1

为此，您需要先创建所需的查询，然后使用 delete() 方法，如下所示:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference itemsRef = rootRef.collection("yourCollection");
Query query = itemsRef.whereEqualTo("field1", "x").whereEqualTo("field2", "y");
query.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
    @Override
    public void onComplete(@NonNull Task<QuerySnapshot> task) {
        if (task.isSuccessful()) {
            for (DocumentSnapshot document : task.getResult()) {
                itemsRef.document(document.getId()).delete();
            }
        } else {
            Log.d(TAG, "Error getting documents: ", task.getException());
        }
    }
});