Python + Firestore : query specific fields from all documents in a collection

Question

I'm trying to read a specific field from all documents in a collection without listing all fields. For example, I want to only read and print Brand from all documents in Donut collection. But right now my python script is printing all fields in all documents (code obtained from: https://firebase.google.com/docs/firestore/quickstart). I couldn't find the answer in it. can someone help?

Answer 1

Try the codes below, it will print all Brand from all documents in Donut collection:

users_ref = db.collection('Donut')
docs = users_ref.stream()
for doc in docs:
    brand = u'{}'.format(doc.to_dict()['Brand'])
    print(brand)

Answer 2

If you just want one field you can use the get() method of the DocumentSnapshot. The code below should work for what you want:

users_ref = db.collection('Donut')
docs = users_ref.stream()
for doc in docs:
    brand = doc.get('Brand')
    print(brand)