things on QSqlRelationalTableModel , QDataWidgetMapper and QTableView

[tbscope]

SIGNAL(setCurrentModelIndex())

SIGNAL(setCurrentModelIndex())

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That's not a signal.

SLOT(currentChanged())

SLOT(currentChanged())

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That's not a slot.

To quote the documentation:

The following example illustrates how to update all widgets with new data whenever the selection of a QTableView named myTableView changes:

QDataWidgetMapper *mapper = new QDataWidgetMapper();
 
 connect(myTableView->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
         mapper, SLOT(setCurrentModelIndex(QModelIndex)));

QDataWidgetMapper *mapper = new QDataWidgetMapper();

 connect(myTableView->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
         mapper, SLOT(setCurrentModelIndex(QModelIndex)));

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