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: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
>> 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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>
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