In this example, following the instructions from get-it-done, it caused a lot of questions in class about if the backref was a column in the database or it could be just initiated in def init. It works like shown below, that is how I did it.

It would be nicer if in the description of the video or in the video itself for get-it-done, where we set the relationship for the classes "Task" and "User", we mention where the backref value comes from and see the match, do I explain myself? Sorry guys, I admire you, I'm just giving you feedback to improve.