Styjun

I'm trying to get the Ids of users i'm following from a firestore stream and then call another stream with the posts of my followings with the ids from previously.

I don't know if this is the right way to architect it and if so how to implement it with flutter.. I've been trying streamBuilder for the first call, but I don't know how to make the second stream call with a list of ids.

The function that I used to get the followings Ids

Stream<QuerySnapshot> followingUsersContent(String uid)
return _firestore.collection("following").document(uid).collection("userFollowing").snapshots();
 

and to get their posts:

Stream<DocumentSnapshot> myContentList(String userId) 
 return _firestore.collection("posts").document(userId).collection("userPosts").document().snapshots();
 

This is how I retrieve the first list of Id's from the widget:

postWidget()
 return Container(
 child: StreamBuilder<QuerySnapshot>(
 stream: usersContentProvider.followingUsersContent(profileId),
 builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot)
 if (!snapshot.hasData) 
 return Text("There's no data");
 

 if (snapshot.hasData) 

 List<DocumentSnapshot> docs = snapshot.data.documents;

 List<UserFollowing> userInfoList = usersContentProvider.getFollowingsUidToList(docs);

 return testUserID(userInfoList); 
 

 ,
 ),
 );
 

Widget testUserID(List<UserFollowing> userInfoList)
 return Container(
 child: Expanded(
 child: ListView.builder(
 itemCount: userInfoList.length,
 itemBuilder: (BuildContext context, i)

 return Text(userInfoList[i].uid ?? "There's no data", style: TextStyle(color: Colors.red),);
 
 ),
 ),
 );
 

So far so good everything is fine.

Now should I put another stream builder inside the listView.Builder() "I don't think it's a good idea".. because it is retrieving a list of uid with the (itemBuilder context, i). Or is there a better way to call the stream with all the uids I have.
Ps the uids are stored in the UserFollowing model:

class UserFollowing
 final String _uid;


 UserFollowing(this._uid);

 String get uid => _uid;

and stored from here:

List getFollowingsUidToList(List<DocumentSnapshot> docList)
 if (docList != null)
 List<UserFollowing> followingUidsList = [];
 docList.forEach((document)
 String uid = document.data["uid"];

 UserFollowing userPost = UserFollowing(uid);
 followingUidsList.add(userPost);
 );
 return followingUidsList;
 
 

All I'm left with now is to communicate a new stream with userFollowing.uid.

How can I do it? thanks.