Question

When clicking on “save” (after creating a new instance) in the Django Admin Site I get an

AttributeError at /admin/bankaccount/bank_account/add/
'Bank_Account' object has no attribute 'id'

I did not create any IDs in the model. The tutorial says that IDs are auto-managed.
Any idea why I get this?

My Model:

class Bank_Account(models.Model):
   iban = models.CharField(max_length = 30)
   bic = models.CharField(max_length = 30)

def __init__(self):
    self.iban = 0
    self.bic = 0

My admin.py

from bankaccount.models import Bank_Account
from django.contrib import admin

admin.site.register(Bank_Account)

Answer 1

I assume from your code sample that you’ve overridden the __init__ (constructor) in your Bank_Account model. However you haven’t called the super. Actually, the actions you take should be expressed as defaults in the model:

class BankAccount(models.Model):
    iban = models.CharField(max_length = 30, default="0")
    bic = models.CharField(max_length = 30, default="0")

which should work fine. However I’m not sure why you want those as defaults; I’d have thought that no default and null=False, blank=False is more appropriate in this case as a bank account will surely always have both IBAN and BIC. Perhaps I’m misunderstanding your domain problem there, though.

The key thing is: don’t override constructors without ensuring you do all the work of the constructor in your superclass(es).