Firebase Firestore: get generated ID of document (Python)

Documentation is very limited on this, but I managed to figure it out through trial and error.

If you want to use add method as the question indicates, instead of a document reference together with a set method, try:

my_data = {"key": "value"}
response = db.collection(u'campaigns').add(my_data)
id = response[1].id
data = response[1].get().to_dict()

Firestore response when using add method contains a tuple:

DatetimeWithNanoseconds object - contains the time the document was created
Firestore document reference that contains id and a document snapshot, from which you can extract the document data by chaining get() and to_dict().

The documentation is unclear, but I finally got it to work:

doc_ref = db.collection(u'campaigns').document()
doc_ref.set(my_data)
print(doc_ref.id)

To get ID after save on Python:

This will return for instance some id like wlJQKyVDsIIpX0x3NBmt

doc_ref = db.collection('promotions').add(data)
return doc_ref[1].id

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