Django: use archive_index with date_field from a related model

Question

Hello (please excuse me for my ugly english :p),

Imagine these two simple models :

from django.contrib.contenttypes import generic
from django.db import models

class SomeModel(models.Model):
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField(_('object id'))
    content_object = generic.GenericForeignKey('content_type', 'object_id')

    published_at = models.DateTimeField('Publication date')


class SomeOtherModel(models.Model):
    related = generic.GenericRelation(SomeModel)

I would like to use the archive_index generic view with SomeOtherModel, but it doesn't work :

from django.views.generic.date_based import archive_index

archive_index(request, SometherModel.objects.all(), 'related__published_at')

The error comes from archive_index at line 28 (using django 1.1) :

date_list = queryset.dates(date_field, 'year')[::-1]

The raised exception is :

SomeOtherModel has no field named 'related__published_at'

Have you any idea to fix it ?

Thank you very much :)

Answer 1

From digging through the Django source code, the generic view archive_index does not appear to support related fields that are GenericRelations.

This is because the queryset method dates does not support generic relations. Consider filing this as a bug / feature request on the Django bug tracker.