[Django] #34719: modelBase.add_to_class is ineffective when called in __init_subclass__ of an abstract Model

[Django]

#34719: modelBase.add_to_class is ineffective when called in __init_subclass__ of
an abstract Model
-------------------------------------+-------------------------------------
Reporter: piscvau | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 4.1
layer (models, ORM) | Keywords: dynamic model
Severity: Normal | modification
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Using an abstract model which is also an abstract class.
In the subclass, I need to modify a field. This is done in the
__init_subclass__ method, by creating a field and adding it to the model
with ModelBase.add_to_class.
The field disappears from the class.

Doing exactly the same on a model which is not an abstract class works
fine.

see unittest file to reproduce this bug.

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Ticket URL: <https://code.djangoproject.com/ticket/34719>
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[Django]

#34719: modelBase.add_to_class is ineffective when called in __init_subclass__ of
an abstract Model
-------------------------------------+-------------------------------------
Reporter: piscvau | Owner: nobody
Type: Bug | Status: new

Component: Database layer | Version: 4.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: dynamic model | Triage Stage:
modification | Unreviewed
Has patch: 0 | Needs documentation: 0

Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by piscvau):

* Attachment "tests_abcmodel_bug.py" added.

unittest test file to reproduce

[Django]

#34719: modelBase.add_to_class is ineffective when called in __init_subclass__ of
an abstract Model
-------------------------------------+-------------------------------------
Reporter: piscvau | Owner: nobody

Type: Bug | Status: closed

Component: Database layer | Version: 4.1
(models, ORM) |

Severity: Normal | Resolution: duplicate

Keywords: dynamic model | Triage Stage:
modification | Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------

Changes (by Simon Charette):

* status: new => closed
* resolution: => duplicate

Comment:

Duplicate of #34555.

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Ticket URL: <https://code.djangoproject.com/ticket/34719#comment:1>