Create Document Id (Contraints) for Firestore (Python)

Firestore Document ID Contraints

• Must be valid UTF-8 characters
• Must be no longer than 1,500 bytes
• Cannot contain a forward slash (/)
• Cannot solely consist of a single period (.) or double periods (..)
• Cannot match the regular expression .*

NOTE: Refer this.

Auto Create

val doc_ref = db.collection("COLLECTION_NAME").document()val doc_id = doc_ref.id

2i5uqlufac0QvPw1YRiE

Using Base64

If the document ID is short, like an email, you can convert it to base64 url safe.

Python 3.x

import base64value = "[email protected]"# optional casefold() to convert to lowercasedoc_id = base64.urlsafe_b64encode(value.casefold().encode('utf-8')).decode('utf-8')

Output

bWVAZ21haWwuY29t

Using MD5

If the String is long or unpredictable.

Python 3.x

import hashlibvalue = "This is my id"doc_id = hashlib.md5(value.encode("utf-8")).hexdigest()

Output

eb741da8f66211d632577a593e80549e

NOTE: MD5 hex output will always be 32 characters regardless of the input value.