Why addMapping doesn't work?

[Vladislav Lisovenko]

Hi.
I have LineEditEx class inherited from QLineEdit. This class has property declared with this code:

Q_PROPERTY(QString guid READ guid WRITE setGuid NOTIFY guidChanged)

When I try to assing some value to guid in usual way everything works fine and:

lineEditEx->guid="sdfsd";

and then I can read assigned value:

qDebug() << lineEditEx->getGuid();

But when I try to add mapping my code doesn't work properly and I don't know why, this code works:

mapper->addMapping(ui->lineEditEx, model->fieldIndex("_id"));

but this code doesn't work:

mapper->addMapping(ui->lineEditEx, model->fieldIndex("_id"), "guid");

[Ni.Sumi]

Hi @Vladislav-Lisovenko ,

QMap<QString, int> map;
map->addMApping(string, int);

It takes only key and value. only 2 parameters.

But in your case mapper->addMapping(ui->lineEditEx, model->fieldIndex("_id"), "guid");
It's 3 inside. So it won't accept.

And from you code mapper->addMapping(ui->lineEditEx, model->fieldIndex("_id"), "guid");
What will you get from the key ui->lineEdit?

[Vladislav Lisovenko]

@Ni.Sumi http://doc.qt.io/qt-5/qdatawidgetmapper.html#addMapping-1
I want to store some guid in lineEdit.

[Ni.Sumi]

Hi @Vladislav-Lisovenko ,

Sorry, I thought that you are using QMap , but yes addMapping is from QDatawidgetMapper .

AFAIK, QLinedit widget has user proeprty by default. How can you give this "guid" to line Edit ? But you can send this "guid" to the widgets like QLabel.

[Vladislav Lisovenko]

@Ni.Sumi I merely want to store hidden data, got from model, in lineEdit-widget.

[SGaist]

Hi,

From your code, it doesn't seem that you have implemented the property properly.

You seem to be using a variable named guid that you have deemed the getter in your Q_PROPERTY declaration thus getGuidisn't the getter.

For variable names, I'd recommend using a prefix like _ to ensure there's no confusion.

[Vladislav Lisovenko]

@SGaist Hi
Getter for guid exists, but this code also doesn't work:

Q_PROPERTY(QString guid READ getGuid WRITE setGuid NOTIFY guidChanged)

Maybe I don't need Q_PROPERTY? But also when I comment line "Q_PROPERTY,,, " It doesn't work. I just need to map some hidden information to widget. I suppose problem not with Q_PROPERTY, problem with addMapping function.

[SGaist]

Silly question but is ui->lineEditEx really a LineEditEx ?

[Vladislav Lisovenko]

@SGaist Yes, of course ;). Code

ui->lineEdit-setGuid("sdfsdf");
qDebug() << ui->lineEdit-getGuid();

works perfectly.

[SGaist]

Can you show how you setup your model and the mapper ?