AttributeError after upgrade to v3.0.0 from 2.11.12

[tbnobody]

NetBox version

v3.0.0

Python version

3.9

Steps to Reproduce

I just upgraded to v3.0.0, run the upgrade.sh script... if no cookie exist in the browser, I see the frontend. But if I press the login button, enter the credentials and press login I get the following exception:

Server Error
There was a problem with your request. Please contact an administrator.

The complete exception is provided below:

<class 'AttributeError'>

'NoneType' object has no attribute '_meta'

Python version: 3.9.2
NetBox version: 3.0.0
If further assistance is required, please post to the NetBox mailing list.

Home Page

Expected Behavior

I just like to login

Observed Behavior

Internal Server Error: /
Traceback (most recent call last):
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "/opt/netbox/netbox/netbox/views/__init__.py", line 145, in get
    return render(request, self.template_name, {
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/shortcuts.py", line 19, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 312, in render
    return nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 195, in render
    return template.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 172, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/templatetags/django_tables2.py", line 167, in render
    return template.render(context={"table": table}, request=request)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 211, in render
    nodelist.append(node.render_annotated(context))
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 167, in render
    values = list(values)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 244, in items
    column.current_value = self.get_cell(column.name)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 197, in get_cell
    return self._get_and_render_with(
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 173, in _get_and_render_with
    return render_func(bound_column, value)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 206, in _call_render
    content = call_with_appropriate(bound_column.render, render_kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/utils.py", line 572, in call_with_appropriate
    return fn(**kwargs)
  File "/opt/netbox/netbox/utilities/tables.py", line 240, in render
    return content_type_name(value)
  File "/opt/netbox/netbox/utilities/utils.py", line 310, in content_type_name
    meta = contenttype.model_class()._meta
AttributeError: 'NoneType' object has no attribute '_meta'

[decode13]

Having the same issue.
Python version: 3.8

Also I see in nginx/error.log:
2021/08/31 09:33:48 [error] 2077#2077: *5 open() "/opt/netbox/netbox/static/netbox.css" failed (2: No such file or directory), client: ::ffff:10.4.19.18, server: netbox.test.com, request: "GET /static/netbox.css HTTP/1.1", host: "netbox.test.com", referrer: "http://netbox.test.com/"

[tbnobody]

You are right. I also see the 404 in the nginx logs...

[jeremystretch]

Could someone who is experiencing this issue please try to provide more information? I'm not able to replicate it either locally or using the demo instance.

The 404 error is unrelated to this (see #7078).

[jeremystretch]

I'm not sure about the root cause, but the exception itself seems easy enough to resolve.

[tbnobody]

I just applied your commit... Now the error changed to

Internal Server Error: /
Traceback (most recent call last):
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "/opt/netbox/netbox/netbox/views/__init__.py", line 145, in get
    return render(request, self.template_name, {
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/shortcuts.py", line 19, in render
    content = loader.render_to_string(template_name, context, request, using=using)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 150, in render
    return compiled_parent._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 62, in render
    result = block.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 312, in render
    return nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 195, in render
    return template.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 172, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/templatetags/django_tables2.py", line 167, in render
    return template.render(context={"table": table}, request=request)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 211, in render
    nodelist.append(node.render_annotated(context))
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 167, in render
    values = list(values)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 244, in items
    column.current_value = self.get_cell(column.name)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 197, in get_cell
    return self._get_and_render_with(
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 173, in _get_and_render_with
    return render_func(bound_column, value)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 206, in _call_render
    content = call_with_appropriate(bound_column.render, render_kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/utils.py", line 572, in call_with_appropriate
    return fn(**kwargs)
  File "/opt/netbox/netbox/utilities/tables.py", line 242, in render
    return content_type_name(value)
  File "/opt/netbox/netbox/utilities/utils.py", line 310, in content_type_name
    meta = contenttype.model_class()._meta
AttributeError: 'NoneType' object has no attribute '_meta'

[tbnobody]

The problem seems to be deeper...
I added

    if contenttype.model_class() is None:                                                                                                                                                                                                                                                       
        return None                    

in row 310... and get the following output (only showing the last couple lines)

  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 167, in render
    values = list(values)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 244, in items
    column.current_value = self.get_cell(column.name)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 197, in get_cell
    return self._get_and_render_with(
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 173, in _get_and_render_with
    return render_func(bound_column, value)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/rows.py", line 206, in _call_render
    content = call_with_appropriate(bound_column.render, render_kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/utils.py", line 572, in call_with_appropriate
    return fn(**kwargs)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django_tables2/columns/templatecolumn.py", line 66, in render
    return Template(self.template_code).render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 172, in render
    return self._render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/test/utils.py", line 100, in instrumented_test_render
    return self.nodelist.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 305, in render
    match = condition.eval(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 889, in eval
    return self.value.resolve(context, ignore_failures=True)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/template/base.py", line 837, in _resolve_lookup
    current = getattr(current, bit)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/contrib/contenttypes/fields.py", line 241, in __get__
    rel_obj = ct.get_object_for_this_type(pk=pk_val)
  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/contrib/contenttypes/models.py", line 175, in get_object_for_this_type
    return self.model_class()._base_manager.using(self._state.db).get(**kwargs)
AttributeError: 'NoneType' object has no attribute '_base_manager'

[tbnobody]

Ok... I changed line 175 to match like this:

try:
    return self.model_class()._base_manager.using(self._state.db).get(**kwargs)
except AttributeError:
    raise ValueError(self)

And the output is:

  File "/opt/netbox-3.0.0/venv/lib/python3.9/site-packages/django/contrib/contenttypes/models.py", line 178, in get_object_for_this_type
    raise ValueError(self)
ValueError: secret

Maybe it has something todo with the removed secret functionallity (I used this function btw...)? Can you reopen that issue? because it seems not to be fixed...

[jeremystretch]

Ok, it seems like the ContentType is still there, but the model isn't. We just need to account for that condition.