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Thread: Empty qsqlrelationaltablemodel

  1. #1
    Join Date
    Jul 2015
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    Exclamation Empty qsqlrelationaltablemodel

    When I put model->select(); after relations, the model is empty, when I put it back before relations, the table displays correctly, but when I edit any cell the whole row becomes empty and gets "!" on the left. No errors.

    Qt Code:
    1. model->setTable("syllabi");
    2. model->setEditStrategy(QSqlTableModel::OnFieldChange);
    3. model->select();
    4. model->setRelation(3, QSqlRelation("activity_types", "activity_type_id", "activity_type_name"));
    5. model->setRelation(0, QSqlRelation("teachers", "teacher_id", "teacher_name"));
    6. //model->select();
    7. qDebug() << model->lastError();
    8.  
    9. ui->tableView->setModel(model);
    10. ui->tableView->setItemDelegate(new QSqlRelationalDelegate(ui->tableView));
    11. ui->tableView->horizontalHeader()->setStretchLastSection(true);
    12. ui->tableView->setColumnHidden(9, true);
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    Last edited by Charlie42; 17th July 2015 at 13:55.

  2. #2
    Join Date
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    Default Re: Empty qsqlrelationaltablemodel

    If adding the related tables causes the rows to disappear it is probably because the value in the main table column is not present in the related table. Impossible to say without seeing the data.

    If editing the row causes it to disappear then possibly the main table does not have a primary key (See http://doc.qt.io/qt-4.8/qsqlrelation...l.html#details).

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