QSqlRelationalTableModel with QSortFilterProxyModel and SqlRelationalDelegate

[bma]

I need sorting and filtering when using QSqlRelationalTableModel,
so im trying to use QSqlRelationalTableModel with QSortFilterProxyModel and QTableView with SqlRelationalDelegate. In that case RelationalDelegate don't work properly (no ComboBox's at TableView for columns with relations).

Here is an example of code:

...
QSqlRealtionalTableModel* model = new QSqlRelationalTableModel(this, db);
model->setRelation(...);
QSortFilterProxyModel* proxy_model = new QSortFilterProxyModel(this);
proxy_model->setSourceModel(model);
 
QTableView* view = new QTableView(this);
view->setItemDelegate(new QSqlRelationalDelegate(this));
view->setModel(proxy_model);
...

...
QSqlRealtionalTableModel* model = new QSqlRelationalTableModel(this, db);
model->setRelation(...);
QSortFilterProxyModel* proxy_model = new QSortFilterProxyModel(this);
proxy_model->setSourceModel(model);

QTableView* view = new QTableView(this);
view->setItemDelegate(new QSqlRelationalDelegate(this));
view->setModel(proxy_model);
...

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