Change QSortFilterProxyModel behaviour for multiple column filtering

Question

We have a QSortFilterProxyModel installed on a QTableView and two (or more) QLineEdit for filtering the view (based on the text of the

Answer 1

Based on @Hayt's answer and comment. Since you want to have two separate filters on your model, You can have two chained QSortFilterProxyModel(one does the filtering based on the name, and the other does the filtering based on the year using the first filtering model as the source model).

Here is a fully working example on how to have two separate filters for one table:

#include 
#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //set up GUI
    QWidget w;
    QVBoxLayout layout(&w);
    QHBoxLayout hLayout;
    QLineEdit lineEditName;
    QLineEdit lineEditYear;
    lineEditName.setPlaceholderText("name filter");
    lineEditYear.setPlaceholderText("year filter");
    lineEditYear.setValidator(new QRegExpValidator(QRegExp("[0-9]*")));
    lineEditYear.setMaxLength(4);
    hLayout.addWidget(&lineEditName);
    hLayout.addWidget(&lineEditYear);

    QTableView tableView;
    layout.addLayout(&hLayout);
    layout.addWidget(&tableView);

    //set up models
    QStandardItemModel sourceModel;
    QSortFilterProxyModel yearFilterModel;
    yearFilterModel.setSourceModel(&sourceModel);
    QSortFilterProxyModel nameFilterModel;
    //nameFilterModel uses yearFilterModel as source
    nameFilterModel.setSourceModel(&yearFilterModel);
    //tableView displayes the last model in the chain nameFilterModel
    tableView.setModel(&nameFilterModel);
    nameFilterModel.setFilterKeyColumn(0);
    yearFilterModel.setFilterKeyColumn(1);
    nameFilterModel.setFilterCaseSensitivity(Qt::CaseInsensitive);
    yearFilterModel.setFilterCaseSensitivity(Qt::CaseInsensitive);

    QObject::connect(&lineEditName, &QLineEdit::textChanged, &nameFilterModel,
            static_cast
            (&QSortFilterProxyModel::setFilterRegExp));
    QObject::connect(&lineEditYear, &QLineEdit::textChanged, &yearFilterModel,
            static_cast
            (&QSortFilterProxyModel::setFilterRegExp));

    //fill with dummy data
    QVector names{"Danny", "Christine", "Lars",
                           "Roberto", "Maria"};
    for(int i=0; i<100; i++){
        QList row;
        row.append(new QStandardItem(names[i%names.size()]));
        row.append(new QStandardItem(QString::number((i%9)+1980)));
        sourceModel.appendRow(row);
    }
    w.show();
    return a.exec();
}