How to expose dynamically amount of data to QML

I have an app were I need to fetch random questions from a database and expose them to qml dynamically.

So I created a class to store each dataset:

Code:

---

class Question : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int id READ id)
    Q_PROPERTY(QString askedQuestion READ askedQuestion)
public:
    Question(int id,
             QString askedQuestion);
 
    int getId() const;
    QString getAskedQuestion() const;
 
private:
    int mId;
    QString mAskedQuestion;
};

---

And fill them in annother class. In reality it is derrived from an SQLDatabaseModel:

Code:

---

class QuestionGenerator : public QObject
{
    Q_OBJECT
public:
    explicit QuestionGenerator(QObject *parent = nullptr);
 
    Q_INVOKABLE QVector<Question> getRandomQuestions(int count) const
    {
        // simplified in reality we fetch random questions from a database. 
        // the point is we need to add Questions to the vector
        // but this does not work since QObject based items cannot get copied
        QVector<Question> questions;
        questions.reserve(count);
 
        // add questions to vector
 
        return questions;
    }
};

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I want to expose `Question` to QML to use the data from `Question` there so I need to derive it from `QObject`.

When I fetch the Questions randomly in `QuestionGenerator` it does not work because `QVector` does net the not supported copy constructor of `QObject`.

So how can I fix this?


Again what I want:

Fetch n Questions in C++ and expose them to QML so I can use the data to display.

Quote:

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When I fetch the Questions randomly in `QuestionGenerator` it does not work because `QVector` does net the not supported copy constructor of `QObject`.

So how can I fix this?

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Store Question * instead of Question in your QVector. Use qDeleteAll() followed by QVector::clear() to delete the contents of the QVector without a memory leak.