access data in firestore QueryDocumentSnapshot collection flutter

[jorge munin]

I am trying to access the data from a subcollection in firestore.

I have a collection that looks like the image

I can access the field name by doing 

name = snapshot.data()['name'] as String;

but how can I access the collection products and his fields. The collection products has a product with a field productName.

I want the product name because I want to display it in a ListTile I am already displaying the list name:

The method where I get the data from the collection is this:

Thanks in advance.

[jorge munin]

I find out that read operations on Firestore are swallow so I have to do this is 2 queries. I am gonna find out now hot to do 2 or more queries in 1 stream

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