How to convert map into array to firestore? flutter

Issue

I have a users id I want to add it to firestore, like this

['GEcuHm3ICpWlEzfq1Z2tAjI2LII3', 'GEcuHm3ICpWlEzfq1Z2tAjI2LII3' ...]

I tried multiple ways but it didn't work

List membersListUid = [];

Future createGroup() async{
    GroupRoomModel newGroup = GroupRoomModel(
        groupName: groupName.text,
        groupRoomId: uuid.v1(),
        owner: userModel.uid,
        membersList: controller.membersList,
        membersListUid: controller.membersListUid.cast() // <---
    );
}
...

Future createGroupFunc() async{
    GroupRoomModel newGroup = GroupRoomModel(
        groupName: groupName.text,
        groupRoomId: uuid.v1(),
        owner: userModel.uid,
        membersList: controller.membersList,
        membersListUid: controller.membersListUid.map((e)=> e).toList() //<---
    );
...

Maybe this helps to understand the code

//Controller class

Map<String, dynamic>? userMap;

  onSearch() async {
    await _fireStore
        .collection('users')
        .where("email", isEqualTo: searchedMembers.text)
        .get()
        .then((value) {
      userMap = value.docs[0].data();
    });
    update();
  }

membersListUid.add({
        "uid": userMap!['uid']
      });

It's still gives me map within array.

Solution

THE PROBLEM:

membersListUid is a List of Maps. That is why you get an array of Maps in your database. You need to get the actual value of the uid from each Map by using the uid key to get the value from the map.

THE SOLUTION:

Update this line:

membersListUid: controller.membersListUid.map((e)=> e).toList()

to this below:

controller.membersListUid.map((e)=> (e as Map<String, dynamic>)['uid']).toList()

Answered By - Victor Eronmosele