delete a document in firebase when you know the field value

问题

Context: In the frontend the user can enter of delete dates for availability. This is how I added a date:

Firestore.instance.collection('availableDates').add({
        'availableDates':date});

But I also need to delete a document from a collection in Firestore. I don't know the document id but I know the the field value which is unique. How would I go about deleting the document if I know the field value within the document. Here is a screen shot of firestore:

回答1:

You can fetch the document first and then delete the document. For example:

refUser.where("city", isEqualTo: "CA").getDocuments().then((snapshot){
  snapshot.documents.first.reference.delete();
});

来源：https://stackoverflow.com/questions/56341378/delete-a-document-in-firebase-when-you-know-the-field-value