<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=437679) </details> <!--IssueSummary end--> ## Summary The method `hook_association_changes` in our codebase currently bypasses certain RuboCop metrics (`Metrics/AbcSize` and `Metrics/PerceivedComplexity`), indicating issues with complexity and size. This issue aims to refactor the method for improved readability and to adhere to our RuboCop standards. ## Details The method is integral for tracking changes in object associations but requires refactoring to enhance its readability and maintainability. ### Reducing Complexity: - Streamline conditional logic for better clarity. - Break down the method into smaller, focused methods to improve readability and ease maintenance. ### Move EE to `ee/` - Features such as `approval_rules` are ee only, so the code related to it, and other features should be moved to the `ee/` directory. ### Enhancing Readability: - Update and refine code comments for clearer understanding. - Align the method with coding standards and re-enable the disabled RuboCop metrics. ### Testing and Documentation: - It's crucial that the existing tests continue to pass post-refactoring, ensuring that functionality remains intact. - While adding new tests is not strictly necessary, it is encouraged to cover any new code paths or logic introduced during refactoring. - Update relevant documentation to reflect any changes in the method’s structure or usage. ## Additional Information - The method is used in merge_request webhook data. - Related MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138564