[Qt-interest] How to get an ID for a description selected in a QComboBox?

[Stephen Kelly]

Marcelo Magno T. Sales wrote:

> Hello,
> 
> In a form, I have a QTableView which uses a QSqlTableModel. This model
> should be filtered to select only those rows where the ID field matches
> a value selected by the user in a QComboBox in this form. However, the
> ID is a FK to another table. In the QComboBox, which uses a model with
> two columns (ID and description), the displayed values are the
> descriptions from that other table. When the user selects a description
> in the QComboBox, I must be able to get its ID to set the filter to the
> QTableView's model. What's the best approach to achieve this? I couldn't
> find a way to get the value of the ID for the selected description, nor
> to get the model index for the selected value in the QComboBox.

Something like this?

connect(m_comboBox, SIGNAL(currentIndexChanged(int)), 
SLOT(updateFilter(int)));

void updateFilter(int row) {
  const QModelIndex idx = m_comboBox->model()->index(row, 0);
  const qint64 id = idx.data(MyModel::IdRole).toLongLong();
  m_tableFilterModel->setFilterRegex(QString::number(id));
}

> 
> Thanks,
> 
> Marcelo