Code review comment for lp:~mhaulo/mixxx/multilevel_crates_playlists

Hi Daniel & the team

> If I understand right, your concept turns Crates into virtual Folders, with
> files and sub-folders.
> Each crate has exactly one parent crate.

> I would prefer if a crate can be member of different parent crates.
> This can be done for example by an additional table which stores the crates
> included in a parent crate.
>

If I remember correctly (it's been a while since the last time I've worked on Mixxx...), the virtual folder thing you described is how it works right now. But I agree with you that it doesn't make sense to restrict a crate to only have one parent crate.

I'm not exactly sure how much time I have available for this task in the near future, so if you're in a hurry with this one, please feel free to take over the task. Even though the changes you proposed (including duplication handling and any other stuff needed) don't sound like anything huge, I might need some extra time to set up a development environment and to recap where I left off almost two year ago :-)