Fix output of relationship name in advice part of alert

[janpio]

Namespace \ was getting eaten.

fixes part of #9

[mpociot]

Hmm this is more an issue with how the relation name can be detected. If you use the relation as a query builder and not just as a property, I can not get access to the relation name. Then I only know about the related class.
So eager loading this would not have any effect at all.
Maybe we should detect if it’s a class name or a property and change the alert / log message in this case.

[janpio]

Fundamentally you might be right, I don't know enough about that.

But for now the addslashes() is there in one place, and not the other - so easily fixable ;)