I am trying to sort column of ModelAdmin list field with admin_order_field with nulls_last such as:
class UserProfileAdmin(admin.ModelAdmin):
def get_sum_amount(self, obj):
return obj.sum_amount
get_sum_amount.admin_order_field = F('sum_amount').desc(nulls_last=True)
But I am getting following error:
Traceback (most recent call last):
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/contrib/admin/options.py", line 606, in wrapper
return self.admin_site.admin_view(view)(*args, **kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 223, in inner
return view(request, *args, **kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/utils/decorators.py", line 45, in _wrapper
return bound_method(*args, **kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1672, in changelist_view
cl = self.get_changelist_instance(request)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/contrib/admin/options.py", line 744, in get_changelist_instance
sortable_by,
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/contrib/admin/views/main.py", line 81, in __init__
self.queryset = self.get_queryset(request)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/contrib/admin/views/main.py", line 436, in get_queryset
qs = qs.order_by(*ordering)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/db/models/query.py", line 1074, in order_by
obj.query.add_ordering(*field_names)
File "/home/petr/.local/share/virtualenvs/aklub_project-HrPEZ5ak/lib/python3.6/site-packages/django/db/models/sql/query.py", line 1804, in add_ordering
if not hasattr(item, 'resolve_expression') and not ORDER_PATTERN.match(item):
TypeError: expected string or bytes-like object
I am using Django 2.2. Is this issue in Django or am I doing something wrong?
