Updating an record with invalid associations results in empty body

[robbevp]

See #999 for a failing test that show this issue

Reproduction steps

In web

1. Go to edit page of track
2. Add the same track artist (with the same role) twice
3. Submit form
4. Rails throws an ActiveRecord::RecordNotFound error. In production this causes an empty body, in development we get the error from rails

Expected behaviour

We should:

• Handle this with errors in the format we expect
• Give the user detailed information about the failing record

System information

Happing in version v0.24.0 (and probably before that as well

[dk5488]

Hey, I'd love to take a look at this and improve the error handling—could you assign the issue to me? Thanks!

[chvp]

• Someone is already working on it
• There is no need to be assigned to work on something
• Note that this project does not accept contributions that are in any way created using generative AI