Re: Issues importing models in between apps

On 30 nov, 07:01, Victor Hooi <victorh...@gmail.com> wrote:
> Hi,
>
> I had an application with a fairly large models.py file, which I split
> up into separate apps to make it easier to manage.

This won't address your problem but FWIW, you don't have to use
separate apps just to split a models.py file - you can turn it into a
models package, with the package's __init__.py used as a "facade" for
the submodules (usual pythonic solution).

But anyway:

> Two of the apps are called "conferences" and "people", each with their
> own models.py.
>
> These two are fairly tightly entwined, they each refer to each other.

If both models really depend that much on each other then they ought
te live in a same module. Or perhaps there's room for improvement in
your design but you don't give enough context.

(snip typical circular deps symptom)

> I'm not sure why this is happening - from the looks of it, it's
> opening up conferences/models.py, then importing people.models.Person
> from there, which inside of that tries to import Conference

In Python almost everything happens at runtime. The import, class and
def statements are executable statements, and they are executed - with
every other top-level statement - when the module is first loaded.

> Or is there a better way of creating multiple apps that all share
> models?

Put the interdependent models in a same app. The you can have other
apps using these models too as long as there's no circular
dependencies.

A Django app doesn't have to define models or views or urls or
whatever - you can have one app with models, and another vwith views
and forms and whatnot depending on the first app's models.

> The main reason I split it up was for logically separating all
> the different models, they still all need to import/relate to each
> other.

Once again: if your models are tightly coupled, they ought to live in
a same module.

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