Hi. Have a look at the django tutorial and take note of how the Poll object is_published method is added to the admin interface (I think it's the part 2 of the tutorial)
Sent from my Windows Phone ------------------------------ From: Saqib Ali Sent: 1/5/2013 10:25 PM To: django-users@googlegroups.com Cc: Saqib Ali Subject: Re: How to add an element of derived data to a Django model? 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:GETRequest URL:http://VVV/admin/Django Version:1.4.3Exception Type:ImproperlyConfiguredException 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 396Python Executable:/usr/bin/pythonPython Version: 2.6.8Python 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 <javascript:> > 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? > > -- > You received this message because you are subscribed to the Google > Groups "Django users" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/django-users/-/d3_X6ZCWMGAJ. > To post to this group, send email to django...@googlegroups.com<javascript:>. > > To unsubscribe from this group, send email to > django-users...@googlegroups.com <javascript:>. > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To view this discussion on the web visit https://groups.google.com/d/msg/django-users/-/jW1G45cE7PIJ. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en. -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
