Is it possible to add a sub collection to a collection without creating document in firestore in android?

Question

I am new to cloud firestore in firebase. In my project I created category as collection which is common to all users. But I need to create category as sub collection for each collection. Is it possible?

Any help will be highly appreciated.

Answer 1

It is possible to add sub collection to collection without creating document in firestore in android?

Definitely not! According to the official documentation, the only structure that is permited is as follows:

db.collection('coll').doc('doc').collection('subcoll').doc('subdoc')

There is no way in Firestore to store a collection beneath other collection. So the following line of code is not allowed:

db.collection('coll').collection('subcoll').doc('subdoc') //Not allowed

As there is no way to store a document beneath other document.

db.collection('coll').doc('doc').doc('subdoc') //Not allowed