QMetaObject::invokeMethod: No such method when using inheritance - c++

Question

I have got a super class Common, which inherits from QObject. Then I have got a class Item, which inherits from Common.
Common.h
class Common : public QObject {
Q_OBJECT
public:
// some methods
};
Item.h
class Item : public Common {
Q_OBJECT
public:
// some methods
void test(QString value);
};
Item.cpp
void Item::test(QString value) {
qDebug() << value;
}
I want to use QMetaObject::invokeMethod to dynamically call a function.
So I implemented a test function in the Item class, which takes exactly one string.
Item* item = new Item();
QMetaObject::invokeMethod(item, "test", Qt::DirectConnection, Q_ARG(QString, "1234"));
This does not work. I get the following error: QMetaObject::invokeMethod: No such method Common::test(QString), which is perfectly okay and fine, because the Common class has no test function.
How can I tell QMetaObject::invokeMethod, that it should call the method from the Item class?

Answer 1

QMetaObject::invokeMethod can only invoke methods known to the Qt meta object system. These are slots and "invokable" functions, the latter being functions with the keyword Q_INVOKABLE before them.
So either write:
class Item : public Common {
Q_OBJECT
public slots:
// ^^^^^
void test(QString value);
};
or:
class Item : public Common {
Q_OBJECT
public:
Q_INVOKABLE void test(QString value);
//^^^^^^^^^
};