I apologize for adding noise to the thread. I didn't read this thread
before replying. Nkryptic is correct.
Sent from my Windows Phone
-----Original Message-----
From: nkryptic
Sent: 1/5/2013 11:59 PM
To: django-users@googlegroups.com
Cc: Saqib Ali
Subject: Re: How to add an element of derived data to a Django model?
Don't add it to the fields for the ModelAdmin, add it to the 'list_display':
class myModelAdmin(admin.ModelAdmin):
list_display = ('a', 'b', 'c')
On Saturday, January 5, 2013 4:25:11 PM UTC-5, Saqib Ali wrote:
I tried Aaron's method. Django validated the model.
However, when I added property "c" to the administration interface's
list of fields, It threw an error:
'myModelAdmin.fields' refers to field 'status' that is missing from the form.
Request Method:
GET
Request URL:
http://VVV/admin/
Django Version:
1.4.3
Exception Type:
ImproperlyConfigured
Exception Value:
'myModelAdmin.fields' refers to field 'status' that is missing from the form.
Exception Location:
/usr/lib/python2.6/site-packages/django/contrib/admin/validation.py in
check_formfield, line 396
Python Executable:
/usr/bin/python
Python Version:
2.6.8
Python Path:
['/WWW/XXX/YYY/ZZZ',
'/usr/lib/python26.zip',
'/usr/lib/python2.6',
'/usr/lib/python2.6/plat-linux2',
'/usr/lib/python2.6/lib-tk',
'/usr/lib/python2.6/lib-old',
'/usr/lib/python2.6/lib-dynload',
'/usr/lib/python2.6/site-packages',
'/usr/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg-info']
Server time:
Sat, 5 Jan 2013 16:17:42 -0500
On Saturday, January 5, 2013 12:16:30 PM UTC-5, Tundebabzy wrote:
I think you can write a function that returns a > b and then make it a
getter method with python's property.
i would have given an example but typing code from my phone isn't very
appealing.
Sent from my Windows Phone
-----Original Message-----
From: Saqib Ali
Sent: 1/5/2013 5:50 PM
To: django...@googlegroups.com
Subject: How to add an element of derived data to a Django model?
I have a Django Model as follows:
class myModel(models.Model):
a = models.IntegerField()
b = models.IntegerField()
I want to add a models.BooleanField() named c to the myModel class.
However the value of c is simply derived from a and b so I don't want
it to be stored in the Database.
I want to c to be True if a > b, otherwise False. I want c to reflect
the correct/current value even when a and b get modifed. And I want to
be able to access c using myModel.c just like I can access a and b.
Is there any way to do this?
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