How to read data from column 0 when I've a QModelIndex

[TomASS]

Hi,

I have const QModelIndex &index and I can read the data by example:

index.model()->data(index, Qt::DisplayRole).toString()

index.model()->data(index, Qt::DisplayRole).toString()

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but how can I read the data from column = 0 (or any other column) and row = index.row() from this same model?

[numbat]

QAbstractItemModel * model = index.model();
model->data(model->index(row, col), Qt::DisplayRole);

QAbstractItemModel * model = index.model();
model->data(model->index(row, col), Qt::DisplayRole);

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[TomASS]

QAbstractItemModel * model = index.model();
model->data(model->index(row, col), Qt::DisplayRole);

QAbstractItemModel * model = index.model();
model->data(model->index(row, col), Qt::DisplayRole);

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Tanks, but I get:

error: invalid conversion from `const QAbstractItemModel*' to `QAbstractItemModel*'

in line:

QAbstractItemModel * model = index.model();

QAbstractItemModel * model = index.model();

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:/

[numbat]

Try:

const QAbstractItemModel * model = index.model();
model->data(model->index(row, col), Qt::DisplayRole);

const QAbstractItemModel * model = index.model();
model->data(model->index(row, col), Qt::DisplayRole);

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[windsword]

Would you kindly add more of your code, I have a similar questions and I found this post, I'm having problem accessing the right data.

in my main constructor, I have the following connect statement:

connect( viewAllPatients, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(rowDoubleClicked(QModelIndex)));

connect( viewAllPatients, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(rowDoubleClicked(QModelIndex)));

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Then, using an example I found online ... my slot is defined below, but I get error with the view widget 'viewAppPatients' (which is a QTableView)

void CentralPage::rowDoubleClicked(const QModelIndex &QMI)
{
    QString sRec = "not valid column";
    QVariant value = viewAllPatients->model()->data(QMI,0);
    if (value.isValid())
        sRec = value.toString();
    qDebug() << sRec;
}

void CentralPage::rowDoubleClicked(const QModelIndex &QMI)
{
    QString sRec = "not valid column";
    QVariant value = viewAllPatients->model()->data(QMI,0);
    if (value.isValid())
        sRec = value.toString();
    qDebug() << sRec;
}

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So, these posts make wonder where would I define/use AbstracItemModel, because this is how I defined model in my constructor:

QSqlQueryModel *model = new QSqlQueryModel;
    model->setQuery("SELECT FirstName,LastName FROM Clients");
    model->setHeaderData(0,Qt::Horizontal, tr("First"));
    model->setHeaderData(1,Qt::Horizontal, tr("Last Name"));
 
    QTableView *viewAllPatients = new QTableView;
    viewAllPatients->setModel(model);
    viewAllPatients->setAlternatingRowColors(true);

QSqlQueryModel *model = new QSqlQueryModel;
    model->setQuery("SELECT FirstName,LastName FROM Clients");
    model->setHeaderData(0,Qt::Horizontal, tr("First"));
    model->setHeaderData(1,Qt::Horizontal, tr("Last Name"));

    QTableView *viewAllPatients = new QTableView;
    viewAllPatients->setModel(model);
    viewAllPatients->setAlternatingRowColors(true);

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[windsword]

typo, I meant:
I get error with the view widget 'viewAllPatients' (which is a QTableView)

[windsword]

Update: I fixed the issue and found why I was getting errors.

In my header file under private, I defined the QTableView:

QTableView *viewAllPatients;

QTableView *viewAllPatients;

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So my Slot callback reads:

void CentralPage::rowDoubleClicked(const QModelIndex &QMI)
{
    QString sRec = "not valid column";
    QVariant value = viewAllPatients->model()->data(QMI,0);
    if (value.isValid())
        sRec = value.toString();
    qDebug() << sRec;
}

void CentralPage::rowDoubleClicked(const QModelIndex &QMI)
{
    QString sRec = "not valid column";
    QVariant value = viewAllPatients->model()->data(QMI,0);
    if (value.isValid())
        sRec = value.toString();
    qDebug() << sRec;
}

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And now, I don't have the error message:

error: ‘viewAllPatients’ was not declared in this scope

error: ‘viewAllPatients’ was not declared in this scope

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