conversion between std::string and QVariant (and vice versa) Qt5

I'm having a hard time of converting std::string to QVariant and QVariant back to std::string. In both cases I end up with empty value (default QVariant, just like it was initialized with no parameters) and empty std::string ("").

These are relevant parts of my code:

bool TestItemListModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    // processing of other function arguments, checks, etc.
    (*myData)[row].setName(value.value<std::string>());
    // here I end up with ""
}

QVariant TestItemListModel::data(const QModelIndex &index, int role) const
{
    // again all the checks, etc.
    return QVariant::fromValue<std::string>((*myData)[row].getName());
}

I found a question similar to this one and this is how it was meant to work. I also did additional thing the answer mentioned, so in my main.cpp I have this:

qRegisterMetaType<std::string>("std::string");

and in my testitemlistmodel.h I have this (before class declaration):

Q_DECLARE_METATYPE(std::string)

I use Qt5.8.

EDIT

I found the source for this type of conversion: http://ift.tt/2tMEgvR. Now I just realized it's quite old and may not work anymore. If that's the case, what would be the best way of doing that?