Unable to edit custom treeview with custom proxy and model: `editing failed`

[Please_Help_me_D]

Hi,

I have inherited from QTreeView, QAbstractItemModel and from QSortFilterProxyModel. It is pretty much of code there but everything work except calling edit() from my custom tree. I get warning: edit: editing failed

I understand that somehow the function edit(index, trigger, event (or shouldEdit()) fails but I can't understand why could tht be.

I have tried it with and without custom item delegate (inherited from QStyledItemDelegate), tried to set different edit triggers but still no luck. The model has flags (and probably some other):

  Qt::ItemFlags flags =
      Qt::ItemIsSelectable |
      Qt::ItemIsEnabled |
      Qt::ItemIsDragEnabled |
      Qt::ItemIsDropEnabled;

There is a thing: no matter what edit trigger I set (even double click) I still can see that by double click items either get expanded or collapsed.
I need to invoke edit() in slot invoked by some action:

void MyTreeView::init(){
  setSortingEnabled(true);
  setSelectionMode(QAbstractItemView::ExtendedSelection);
  setContextMenuPolicy(Qt::CustomContextMenu);
  header()->setContextMenuPolicy(Qt::CustomContextMenu);
  setDragDropMode(QAbstractItemView::DragDropMode::DragDrop);
  setDragEnabled(true);
  setAcceptDrops(true);
  setDropIndicatorShown(true);

  MyDelegate* itDelegate = new MyDelegate(this);
  this->setItemDelegate(itDelegate);

  MyProxy* proxy = new MyProxy(this);
  MyModel* model = new MyModel(proxy);
  proxy->setSourceModel(model);
  this->setModel(proxy);

  QAction *renameAction = menu->addAction("Rename object");
  connect(renameAction, &QAction::triggered, this,  &MyTreeView::onRenameObject);
  ...
}

void MyTreeView::onRenameObject(){
  this->edit(currentIndex());
}

openPersistentEditor() works but I hope I solve the problem usin edit() function.
At the time when edit() is called the view state is QAbstractItemView::NoState.

What i'm missing?

[Please_Help_me_D]

I'm idiot I missed Qt::ItemIsEditable flag...

Don't know how it is possible to look at many times flags, even write them on the forum and still miss it... I hope I'm not alone :)