diegueus9 diegueus9 - 5 months ago 21
Python Question

Split models.py into several files

I'm trying to split the

models.py
of my app into several files:

My first guess was do this:

myproject/
settings.py
manage.py
urls.py
__init__.py
app1/
views.py
__init__.py
models/
__init__.py
model1.py
model2.py
app2/
views.py
__init__.py
models/
__init__.py
model3.py
model4.py


This doesn't work, then i found this, but in this solution i still have a problem, when i run
python manage.py sqlall app1
I got something like:

BEGIN;
CREATE TABLE "product_product" (
"id" serial NOT NULL PRIMARY KEY,
"store_id" integer NOT NULL
)
;
-- The following references should be added but depend on non-existent tables:
-- ALTER TABLE "product_product" ADD CONSTRAINT "store_id_refs_id_3e117eef" FOREIGN KEY ("store_id") REFERENCES "store_store" ("id") DEFERRABLE INITIALLY DEFERRED;
CREATE INDEX "product_product_store_id" ON "product_product" ("store_id");
COMMIT;


I'm not pretty sure about this, but i'm worried aboout the part
The following references should be added but depend on non-existent tables:


This is my model1.py file:

from django.db import models

class Store(models.Model):
class Meta:
app_label = "store"


This is my model3.py file:

from django.db import models

from store.models import Store

class Product(models.Model):
store = models.ForeignKey(Store)
class Meta:
app_label = "product"


And apparently works but i got the comment in
alter table
and if I try this, same thing happens:

class Product(models.Model):
store = models.ForeignKey('store.Store')
class Meta:
app_label = "product"


So, should I run the alter for references manually? this may bring me problems with south?

Ted Ted
Answer

I can't even begin to imagine why you'd want to do this. But I'll assume you've got a good reason. If I needed to do this for some reason, I'd do the following:

myproject/
    ...
    app1/
        views.py
        __init__.py
        models.py
        submodels/
            __init__.py
            model1.py
            model2.py
    app2/
        views.py
        __init__.py
        models.py
        submodels/
            __init__.py
            model3.py
            model4.py

Then

#myproject/app1/models.py:
    from submodels/model1.py import *
    from submodels/model2.py import *

#myproject/app2/models.py:
    from submodels/model3.py import *
    from submodels/model4.py import *

But, if you don't have a good reason, put model1 and model2 directly in app1/models.py and model3 and model4 in app2/models.py

---second part---

This is app1/submodels/model1.py file:

from django.db import models
class Store(models.Model):
    class Meta:
        app_label = "store"

Thus correct your model3 file:

from django.db import models
from app1.models import Store

class Product(models.Model):
    store = models.ForeignKey(Store)
    class Meta:
        app_label = "product"

Edited, in case this comes up again for someone: Check out django-schedule for an example of a project that does just this. https://github.com/thauber/django-schedule/tree/master/schedule/models https://github.com/thauber/django-schedule/