How to rename a child with only parent index known in a treeview ?

[Ratzz]

I am working on a QStandardItemModel with only the index of parent know how can i rename the child.
I used setItem with parent row and column as 1 it returns 0

       Model->setItem(row,1,item);

I even tried setData but it works only for parent

        ui->treeView->model()->setData(parentIndex,new_name,Qt::EditRole);

How can i rename a child with only parent index known in a treeview?

[kshegunov]

@Ratzz
Hello,
Retrieve the child model index first with QModelIndex::child and then set your data.

Kind regards.

[Ratzz]

@kshegunov
Thanks for your reply.
Yes retrieving the child model via child and then setting data worked for me .