What method needs to be invoked to change the value of the 'role' parameter of the QAbstractListModel::data method?

mirro

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

QVariant ReaderModel::data(const QModelIndex &index, int role) const
{
    if(index.row() < rowCount())
        switch(role){
        case IdRole: return m_readers.at(index.row())->id();
        case PasswordRole: return m_readers.at(index.row())->password();
        case RecordRole: return m_readers.at(index.row())->record();
        default: return QVariant();
        }
    return QVariant();
}

QHash<int, QByteArray> ReaderModel::roleNames() const
{
    static const QHash<int, QByteArray> roles{
        {IdRole, "id"},
        {PasswordRole, "password"},
        {RecordRole, "record"}
    };
    return roles;
}

#ifndef READERMODEL_H
#define READERMODEL_H

#include <QAbstractListModel>
#include <QJsonValueRef>
#include <QVariant>
#include "reader.h"
#include "record.h"

class ReaderModel :  public QAbstractListModel
{
    Q_OBJECT
    Q_PROPERTY(Reader* me READ me WRITE setMe NOTIFY meChanged)
public:
    enum ReaderRole {
        IdRole = Qt::DisplayRole, //0
        PasswordRole = Qt::UserRole,
        RecordRole
    };
    Q_ENUM(ReaderRole)

    ReaderModel(QObject *parent = nullptr){Q_UNUSED(parent);}

    int rowCount(const QModelIndex & = QModelIndex()) const;
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
    QHash<int, QByteArray> roleNames() const;

    Q_INVOKABLE QVariantMap get(int row) const;
    Q_INVOKABLE void append(const QString &id, 
                            const QString &password);
    Q_INVOKABLE void set(int row, const QString &id,
                         const QString &password);
    Q_INVOKABLE void remove(int row);

    Q_INVOKABLE Reader *me() const;
    Q_INVOKABLE void setMe(Reader *r);

private:
    QList<Reader*> m_readers;
    Reader *me_;
signals:
    void meChanged();
};

#endif // READERMODEL_H

sierdzio

You want to display id, password, record from QML, right? Then you need something like this:

ListView {
  model: yourReaderModel
  delegate: Text {
    height: 30; width: 150
    text: model.id + ", " + model.password + ", " + model.record
  }
}

If it does not work, use modelData instead of model.