At the current state board lists are serialized using `as_json` method in the model which is difficult to maintain, specially when adding new fields that are methods. We should start using serializers + entities for lists like we do for most of the models. The following discussion from gitlab-ce!31069 should be addressed: - [ ] @engwan started a [discussion](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31069#note_198530573): (+1 comment) > Our [best practices doc](https://docs.gitlab.com/ee/development/code_comments.html) says we should create the issue and link to it here