Bug: setting reverse OtO is not persisted

[pierremonico]

Hi

I have an issue where I have two models A and B. B has a OneToOne field called a pointing to the A model, with related_name set to b.

Whenever I create A objects through the API and set the JSON b field to the ID of an existing B object, I get a 201 response (with the b key correctly set in the response body), but this relationship is actually not persisted in the database .

I have created a repo with a minimal implementation where this can be reproduced. It also includes a failing test.

I believe following issues/MRs reference the same problem, but I can't tell for sure:

• ModelSerializer: OneToOne reverse relationships don't save in create() #5996
• PR7554
• Save reverse OneToOne relations, possible fix for issue #5996  #7547

Originally posted by @pierremonico in #7987

[lovelydinosaur]

Closing this in favour of the existing discussion ticket.