Unable to fetch random data from Firestore!

[tusharkhatriofficial]

I am trying to fetch some data randomly from Firestore basically this case is little complex, I looked at the documentation too but am unable to find a solution. So the database contains a collection called userData and this collection store several documents which are the UID's of the users and finally each of these document contains a collection called craft and finally this craft collection contains details like name and other fields.

I tried to get a hold to this data as shown below:

Stream: FirebaseFirestore.instance.collection('userData').doc((FirebaseAuth.instance.currentUser!).uid).collection('craft').snapshots(),
and this way I was able to fetch data related to the user Id provided in .doc()

but now I want to display same data on another screen but don't want to fetch data related to a particular user so I am unable to figure out what to put into .doc() to fetch all the random records.

Stream: FirebaseFirestore.instance.collection('userData').doc().collection('craft').snapshots(),

Any kind of help is appreciable ! 😊