Changes between Initial Version and Version 1 of Ticket #33984


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Timestamp:
Sep 6, 2022, 6:33:33 AM (2 years ago)
Author:
joeli
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  • Ticket #33984 – Description

    initial v1  
    1 I'm upgrading our codebase from Django 3.2 to 4.1, and came upon a regression when running our test suite. I bisected it down to commit [4f8c7fd9d9 Fixed #32980 -- Made models cache related managers](https://github.com/django/django/commit/4f8c7fd9d91b35e2c2922de4bb50c8c8066cbbc6).
     1I'm upgrading our codebase from Django 3.2 to 4.1, and came upon a regression when running our test suite. I bisected it down to commit 4f8c7fd9d9 Fixed #32980 -- Made models cache related managers: [https://github.com/django/django/commit/4f8c7fd9d91b35e2c2922de4bb50c8c8066cbbc6]
    22
    33The main problem is that when you have fetched a model containing a m2m field from the database, and access its m2m field the manager gets cached. If you then set the model's `.pk` to `None` and do a `.save()` to save it as a copy of the old one, the related manager cache is not cleared. Here's some code with inline comments to demonstrate:
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