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()

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);

[TomASS]

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


Tanks, but I get:


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

QAbstractItemModel * model = index.model();

:/

[numbat]

Try:


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

[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)));

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;
}


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);

[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;
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;
}

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

error: ‘viewAllPatients’ was not declared in this scope