How can i change the field type in django models by overriding the class

Question

I have one class in core folder as below:

class AbstractLine(models.Model):
    basket = models.ForeignKey('basket.Basket', related_name='lines',
                           verbose_name=_("Basket"))

    quantity = models.PositiveIntegerField(_('Quantity'), default=1)

Now I want to override this class in order to change the quantity PositiveIntegerField to DecimalField as below:

from django.db import models
from django.utils.translation import ugettext_lazy as _
from oscar.apps.basket.abstract_models import AbstractLine as ModelLine

class Line(ModelLine):
    quantity = models.DecimalField(_('Quantity'), default=0.25, decimal_places=2, max_digits=3)

How can I achieve this?

Is AbstractLine actually an abstract class? – Daniel Roseman Oct 01 '14 at 12:28 — Daniel Roseman, Oct 01 '14 at 12:28
Yes. it is abstract class. – Sreekanth Kuriyala Oct 01 '14 at 12:35 — Sreekanth Kuriyala, Oct 01 '14 at 12:35
what is wrong with the way you have it written? – Burhan Khalid Oct 01 '14 at 12:42 — Burhan Khalid, Oct 01 '14 at 12:42
This way is not working #Burhan Khalid – Sreekanth Kuriyala Oct 01 '14 at 13:31 — Sreekanth Kuriyala, Oct 01 '14 at 13:31

score 1 · Answer 1 · edited May 23 '17 at 12:13

1

Actually, it's not possible. See this question: In Django - Model Inheritance - Does it allow you to override a parent model's attribute?

The same applies to abstract base classes also, see this discussion on the Django user's group.

Your best bet is to simply delete the field from the base class.

edited May 23 '17 at 12:13

Community

1
1

answered Oct 01 '14 at 12:46

michaelb

747
3
9

How can i change the field type in django models by overriding the class

1 Answers1