class business(models.Model):
name=models.CharField(max_length=40, blank=True, null=True)
class phone(models.Model):
business=models.ForeignKey(business, verbose_name='Business',blank=False)
number=models.CharField(max_length=40, blank=True, null=True)
And in the admin.py i have:
class businessAdmin(admin.ModelAdmin):
model=business
search_fields = phone__number