Not the author, but I no not understand the desire to use multiple apps. I am never going to want to carve one out as a separate module I re-use in another product. It is all interconnected, why add arbitrary boundaries separating them? Put everything into a "core" app and move on with life. Maybe if you are an enormous organization working on Instagram where you have rigid responsibilities per team.
So you’d prefer one file with all models? Do you break out into apps for business logic? Keep models in one app/file. Then domain driven design elsewhere?
As things get more complicated, I will separate out by some kind of concept. Which can be something as simple as:
You can do a more sophisticated module layout, but essentially something as straightforward as the above, all under a single "core" application. Prevents Django from fighting you when you want to work across the arbitrary "app" boundary.You don't have to put all your modules into a single file. You can break them into multiple files and the import them into a model file just so that Django loads it from the expected location.
Instead of apps you can just split your components inside a single app using regular python modules.