Why aren't all my documents updated in Firestore?

Question

I'm using python for trying to add a field to more than 750 documents in a firestore collection, but when trying to do this, only my first 55 documents get updated. I'm assuming this happens because of the firestore write limits but don't really get why.

COLLECTION STRUCTURE

Note: actividades is an array with a size around of 20 elements and each element has only 3 properties.

CODE

import firebase_admin
from firebase_admin import credentials, firestore

cred = credentials.Certificate('avancesAccountKey.json')
default_app = firebase_admin.initialize_app(cred)
db = firestore.client()

count = 0
avances = db.collection('avances').get()
for e in avances:  
    db.collection('avances').document(e.id).update({
        'vigente': False
    })
    count += 1

print(count) # count is 55 when trying to update, 757 otherwise

What is exactly happening and how I can solve this?

Answer 1

You shouldn't mutate the collection as you iterate through it. Instead, fetch the document references and then iterate.

count = 0
documents = [snapshot.reference for snapshot in db.collection('avances').get()]
for document in documents:
    document.update({u'vigente': False})
    count += 1

Reference: https://github.com/GoogleCloudPlatform/google-cloud-python/issues/6033

Update: It appears the Firestore python client does have a 20 second timeout for the generator returned from a query.