Problem with the const

[aekilic]

Dear All

I have a function like this

double form::calculate(const QString &)
{
	id_st= id;
	load();
 
	return spin->value();
}

double form::calculate(const QString &)
{
	id_st= id;
	load();

	return spin->value();
}

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I try to call this function from

QVariant CustomSql::data(const QModelIndex &index, int role) const
{
 
    QVariant value = QSqlTableModel::data(index, role);
    if (value.isValid() && role == Qt::DisplayRole) {
		if (index.column() == 5){
                      calculate(index.sibling(index.row(),3).data().toString());
		}
		return value.toString().leftJustified(true);
	}
    return value;
}

QVariant CustomSql::data(const QModelIndex &index, int role) const
{

    QVariant value = QSqlTableModel::data(index, role);
    if (value.isValid() && role == Qt::DisplayRole) {
		if (index.column() == 5){
                      calculate(index.sibling(index.row(),3).data().toString());
		}
		return value.toString().leftJustified(true);
	}
    return value;
}

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I get the error for discard qualifiers ? How can I solve this one?