addItem method
Implementation
@override
PostModel addItem(PostModel model, MemberMediumContainerModel newItem) {
List<MemberMediumContainerModel> newItems = model.memberMedia == null
? []
: model.memberMedia!.map((e) => e).toList();
newItems.add(newItem);
var newModel = model.copyWith(memberMedia: newItems);
return newModel;
}