QTableView doesn't seem to react on dataChanged signal - qt

Question

Shown below is the my custom table model. I am trying to use that tablemodel together with a QTableView. If the method append of the table model is called I would expect the table view to update its contents. But it doesn't and I don't know why. If however I use that same table model together with a QListView, everything works fine, i.e. the list view does update its contents, when append of the table model gets called. Is there anything special I need to do in case of the QTableView?
class MyModel : public QAbstractTableModel
{
public:
MyModel(QObject* parent=NULL) : QAbstractTableModel(parent) {}
int rowCount(const QModelIndex &parent = QModelIndex()) const {
return mData.size();
}
int columnCount(const QModelIndex &parent = QModelIndex()) const {
return 2;
}
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const {
if (!index.isValid()) {
return QVariant();
}
if (role == Qt::DisplayRole) {
if (index.column()==0) {
return QVariant(QString::fromStdString(getFirst(index.row())));
}
if (index.column()==1) {
return QVariant(QString::fromStdString(getSecond(index.row())));
}
}
return QVariant();
}
void append(std::string const& first, std::string const& second) {
mData.push_back(std::make_pair(first, second));
emit dataChanged(index(mData.size()-1, 0), index(mData.size()-1, 1));
}
std::string const& getFirst(int i) const {
return mData[i].first;
}
std::string const& getSecond(int i) const {
return mData[i].second;
}
protected:
std::vector<std::pair<std::string, std::string> > mData;
};

Answer 1

As you're inserting a new row instead of changing existing data, you should use beginInsertRows and endInsertRows instead:
void append(std::string const& first, std::string const& second) {
int row = mData.size();
beginInsertRows( QModelIndex(), row, row );
mData.push_back(std::make_pair(first, second));
endInsertRows();
}
See if that helps.