QSqlQueryModel downcasting problem !

_compiler

class Model : public QSqlQueryModel {
    QVariant data(const QModelIndex &item, int role = Qt::DisplayRole) const;
};

QSqlQueryModel *model = new QSqlQueryModel();
model->setQuery("select * from table");

Model *derived = static_cast<QSqlQueryModel*>(model );  

ui->tableView->setModel(derived);  //not working

mrjj

@_compiler said:
Hi


 Model *derived = static_cast<QSqlQueryModel*>(model );  

Should it not be 
 Model *derived = static_cast<Model *>(model );

?

SGaist

Hi,

To add to @mrjj, it should be qobject_cast

kshegunov

@_compiler

Model *derived = static_cast<QSqlQueryModel*>(model);

This isn't a valid cast because you can't implicitly cast to a derived type (see @mrjj's comment).

Model *derived = static_cast<Model *>(model);

Is valid but unsafe, as @SGaist pointed out.

Ultimately, what is not working?