models

[Robin Riis]

if i have a model like

class ShelfManager(models.Manager):

use_for_related_fields = True

def create_cabinet(self, name, number_of_shelfs):

cabinet = self.create(name=name, number_of_shelfs=number_of_shelfs)

created_shelfs = 0

while created_shelfs < number_of_shelfs:

cabinet.shelfs.create()

created_shelfs += 1

return place

class Cabinet(models.Model):

name = models.CharField(max_length=50, unique=True)

number_of_shelfs = models.IntegerField

shelfs = ShelfManager()

class Shelfs(models.Model):

place = models.ForeignKey(Cabinet, on_delete=models.CASCADE, null=True, blank=True, related_name='shelfs')

...

and i want shelf to hold either model Box, Filter or Barrel

but not sure which approach to use :P

[Mohammad Etemaddar]

The one who should have foreign key is is filter, box and barel to shelf.

Then you can access them from shelf:

Shelf0.boxs

Shelf0.barels

And shelf0.filters

Note that you can set the relation_name in foreign key so that you can use the related name instead of filters, boxs and barels

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