Get a single document with many collections from FirebaseFirestore

Question

I am trying to get a stream of a single document that has multiple collections from Firebase Firestore.

data structure:

{
    "answers": [
        {
            "test@email.com": {
                "anger": [
                    {
                        "1": {
                            "answerText": [
                                "answer1",
                                "answer2",
                                "answer3"
                            ],
                            "category": "anger",
                            "dateCreated": "2023-05-05T14:54:49.297",
                            "lastModified": "2023-06-05T14:54:49.297",
                            "step": "1",
                            "watchedVideo": false
                        }
                    },
                    {
                        "2": {
                            "answerText": [
                                "answer1",
                                "answer2",
                                "answer3"
                            ],
                            "category": "anger",
                            "dateCreated": "2023-05-05T14:54:49.297",
                            "lastModified": "2023-06-05T14:54:49.297",
                            "step": "2",
                            "watchedVideo": false
                        }
                    }
                ],
                "anxiety": [
                    {
                        "1": {
                            "answerText": [
                                "answer1",
                                "answer2",
                                "answer3"
                            ],
                            "category": "anxiety",
                            "dateCreated": "2023-05-05T14:54:49.297",
                            "lastModified": "2023-06-05T14:54:49.297",
                            "step": "1",
                            "watchedVideo": false
                        }
                    },
                    {
                        "3": {
                            "answerText": [
                                "answer1",
                                "answer2",
                                "answer3"
                            ],
                            "category": "anxiety",
                            "dateCreated": "2023-05-05T14:54:49.297",
                            "lastModified": "2023-06-05T14:54:49.297",
                            "step": "3",
                            "watchedVideo": false
                        }
                    }
                ]

            }
        }
    ]
}

Below is what I currently have working but this is only getting one of the collections for the user.

I want all of the collections below the user's email address.

Stream<Iterable<AnswerModel>> getAllUserAnswers({
    required UserModel user,
  }) {
    String uid = user.email;
    print('GETTING USER ANSWERS: answers/$uid/');
    return FirebaseFirestore.instance
        .collection('answers').doc(uid).collection('anger')
        .snapshots()
        .map(
          (snapshot) => snapshot.docs
            .map((doc) => AnswerModel.fromMap(doc.data())).toList()
    );
  }

And here is how I am using the method above inside a StreamBuilder.

return StreamBuilder(
      stream: answerRepo.getAllUserAnswers(user: userModel),
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            userAnswers = snapshot.data as List<AnswerModel>;

            if (userAnswers.isNotEmpty) {
              return ListView.builder(
                padding: const EdgeInsets.fromLTRB(20, 20, 20, 20),
                itemCount: userAnswers.length,
                itemBuilder: (context, index) {
                  var category = userAnswers[1].category;

                  return Padding(
                    padding: const EdgeInsets.fromLTRB(0, 20, 0, 20),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.spaceBetween,
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        // ...add items to display info from stream
                    ],)
                  );
                },
              ),
            }
          }
      });