Description

This fixes the custom reason field being shared between inherited models. It causes issues when calling update() on the historical model. When generating the field, a clone() call is added so the field wouldn't be shared.

Related Issue

Fixes #1433

How Has This Been Tested?

Added unit tests reproducing the issue. The tests fail on master branch.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or github handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.