QSqlQueryModel and QTableView, with a custom ItemDelegate

I have http://doc.qt.io/qt-4.8/QTableView connected with http://doc.qt.io/qt-4.8/QSqlQueryModel, the first column I inserted it after populating data from database. The first column will be checkbox, checked is the second column have a matched value from a QStringList variable I pass to the delegate. My problem is the delegate never draws http://doc.qt.io/qt-4.8/QCheckBox on the first column.
Here is how I set the delegate:

Code:

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QString sqlQuery;
    sqlQuery = "SELECT ProCode, ProName, ProPrice FROM Promotions";
 
    QSqlQueryModel *model = new QSqlQueryModel;
    model->setQuery(sqlQuery);
    model->insertColumns(0, 1);
 
    ui->promotionsList->setModel(model);
 
    QStringList promotions = this->workerMod->promotionsList->text().split(',');
 
    PromotionDelegate *checkDelegatePromos = new PromotionDelegate(this);
    checkDelegatePromos->setPromotions(promotions);
    ui->promotionsList->setItemDelegate(checkDelegatePromos);

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The delegate I implement:

Code:

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QWidget *PromotionDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if(index.isValid() && index.column() == 0)
    {
        //QMessageBox::critical(0, QString::number(index.row()), "1"); Also, this message never fired up!
        QCheckBox *check = new QCheckBox(parent);
        check->setCheckState(Qt::Unchecked);
        return check;
    }
   else
       return QItemDelegate::createEditor(parent, option, index);
}
 
void PromotionDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
    if(index.isValid() && index.column() == 0)
    {
        QCheckBox *check = static_cast<QCheckBox *>(editor);
        QModelIndex inx = index.model()->index(index.row(), 1);
        QString prom = index.model()->data(inx, 0).toString();
        for(int i = 0; i< this->m_promotions.length(); ++i)
        {
            if(this->m_promotions.at(i) == prom)
            {
                check->setCheckState(Qt::Checked);
                break;
            }
        }
    }
    else
        QItemDelegate::setEditorData(editor, index);
}
 
void PromotionDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                    const QModelIndex &index) const
{
 
}
 
void PromotionDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if(index.isValid() && index.column() == 0)
    {
        editor->setGeometry(option.rect);
    }
    else
        QItemDelegate::updateEditorGeometry(editor, option, index);
}
 
void PromotionDelegate::setPromotions(QStringList &promotions)
{
    this->m_promotions = promotions;
}

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