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table.html throws an 'NoneType' object has no attribute '_base_manager' when a plugin is disabled #7430
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opened 2025-12-29 20:23:24 +01:00 by adam
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complexity: high
complexity: low
complexity: medium
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severity: medium
status: accepted
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topic: GraphQL
topic: Internationalization
topic: OpenAPI
topic: UI/UX
topic: cabling
topic: event rules
topic: htmx navigation
topic: industrialization
topic: migrations
topic: plugins
topic: scripts
topic: templating
topic: testing
type: bug
type: deprecation
type: documentation
type: feature
type: housekeeping
type: translation
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Reference: starred/netbox#7430
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Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Originally created by @PieterL75 on GitHub (Dec 29, 2022).
Originally assigned to: @jeremystretch on GitHub.
NetBox version
v3.3.10
Python version
3.8
Steps to Reproduce
Expected Behavior
Homepage is shown
Observed Behavior
An error is thrown referencing the changelog object of the disabled plugin
I ran again this, when I had to disable a plugin after upgrading to v3.4, as the plugin was not yet compatible.
It would be great if the changelog is not that sensitive to disabled/removed plugins. I see this issue surfaces regularly and on different places where the changelog is shown
@jeremystretch commented on GitHub (Dec 29, 2022):
Thanks for capturing this. I've run into it a few times during the course of development. It's going to be a bit tricky to solve for I'm afraid, since removing the plugin without clearing out its associated content types leaves the database in an invalid state. #10696 might help with this.
@PieterL75 commented on GitHub (Dec 29, 2022):
I understand that with the uninstallation of a plugin, that you want to remove all stale/db data.
But this is the case of temporary disabling a plugin, with the purpose to retain the data in the database.
Thx for looking into it !
@jeremystretch commented on GitHub (Dec 29, 2022):
The root issue is that Django (understandably) assumes that any entry in the content types table will map to a valid Python model, and there doesn't appear to be any obvious hook on generic foreign keys for handling the condition where the model does not exist. So it may take some digging to devise a workable solution.
@abhi1693 commented on GitHub (Jan 14, 2023):
I'm not sure if this will be accepted as an answer. However, I feel when a plugin is removed it can be assumed the data is no longer needed. So, if
ObjectChangeallowsCASCADEdeletion forchanged_object_typeandrelated_object_type,remove_stale_contenttypescommand can help cleanup the tables.Here is diff for the change
The command needed for cleanup of DB along with results
@abhi1693 commented on GitHub (Jan 14, 2023):
I can submit a PR if my comment is accepted as a solution
@jeremystretch commented on GitHub (Jan 16, 2023):
I think this was @PieterL75's concern above though. We need a way to let users temporarily disable a plugin without deleting its data.
@julianstolp commented on GitHub (Jan 23, 2023):
So until this is fixed I need to delete all changelog data for the specific plugin in order to be able to view all my changelog, if i would uninstall the plugin? It does not matter if it is permanent or temporary. Maybe this should be linked to the documentation.