Question 78168 in Flutter Question posted in
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The operator '[]' isn't defined for the class 'Iterable<dynamic>' – Flutter

[!Here is the code where i got an error, I could not use [] for this code

return ListView.builder(
          reverse: true,
          itemCount: chatDocs?.length,
          itemBuilder: (ctx, index) => MessageBubble(
              chatDocs[index].data()['text'],
              chatDocs[index].data()['username'],
              chatDocs[index].data()['userImage'],
              chatDocs[index].data()['userId'] == user.uid,


          ),
          // Container(
          //   padding: const EdgeInsets.all(8),
          //    child:  Text(chatDocs?[index]['text']),)
        );

I also tried null check and ‘as Map’ to chat-Docs, But both are didnot work

Tags:

3

Answers


  1. 0

    add .toList() in chatDocs declaration line
    so it becomes like this:

    final chatDocs = chatSnapshot.data?.docs.toList();
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  2. 0

    .map returns an Iterable which doesn’t have the [] operator. You can solve this by turning it into a list by calling toList() on it. So

    final chatDocs = chatSnapshot.data?.docs.map(docs).toList();

    But it looks like your map() is already wrong. Note the error there. Do you really need to map it? If not then this already should work

    final chatDocs = chatSnapshot.data?.docs;

    Or actually this to handle it in case it’s null

    final chatDocs = chatSnapshot.data?.docs ?? [];
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  3. 0

    You can use this way,

    StreamBuilder(
          stream: _yoursteam,
          builder: ((context, AsyncSnapshot snapshot) {
            return snapshot.hasData
                ? Padding(
                    padding: const EdgeInsets.symmetric(vertical: 5),
                    child: ListView.builder(
                      itemCount: snapshot.data.docs.length,
                      itemBuilder: (context, index) {
                        return MsgTile(
                           snapshot.data.docs[index]["msgId"],
                           snapshot.data.docs[index]["time"],
                          snapshot.data.docs[index]["message"],
                          snapshot.data.docs[index]["sender"],
                          FirebaseAuth.instance.currentUser!.uid ==
                              snapshot.data.docs[index]["uid"],
                        );
                      },
                    ),
                  )
                : Container();
          }),
        );
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