network_inventory/src/customers/models.py

from django.db import models
from core.models import Company
from core.models import InventoryUser


class Owner(Company):
    pass


class Customer(Company):
    name = models.CharField(max_length=50, unique=True)
    project_manager = models.ForeignKey(
        InventoryUser, null=True, blank=True, on_delete=models.SET_NULL
    )

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        from django.urls import reverse

        return reverse("customer", args=[str(self.id)])


class DeviceManufacturer(Company):
    class Meta:
        ordering = ["name"]
        verbose_name_plural = "Device Manufacturers"


class Location(models.Model):
    name = models.CharField(max_length=50)
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)

    def __str__(self):
        return self.name


class DummyLocation(models.Model):
    location = models.ForeignKey(Location, on_delete=models.CASCADE)

    def __str__(self):
        return self.location.name