This seems like an easy question but I couldn't find an answer after spending about ten minutes searching. I think it's because it's hard to create a good search engine query for this question.
The closest answer I found was this: Should there be a comma between 'you' and 'darling' here?. But, the two scenarios seem a little different.
I distinctly remember being taught by my English teacher that there is a comma between you and the object but whenever I see it these days in a book or newpaper, the comma seems to be missing. Which is correct?