gitlab-org--gitlab-foss/doc/development/issuable-like-models.md

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# Issuable-like Rails models utilities
GitLab Rails codebase contains several models that hold common functionality and behave similarly to
[Issues](https://docs.gitlab.com/ee/user/project/issues/). Other examples of "issuables"
are [Merge Requests](https://docs.gitlab.com/ee/user/project/merge_requests/) and
[Epics](https://docs.gitlab.com/ee/user/group/epics/).
This guide accumulates guidelines on working with such Rails models.
## Important text fields
There are max length constraints for the most important text fields for `Issuable`s:
- `title`: 255 chars
- `title_html`: 800 chars
- `description`: 1 megabyte
- `description_html`: 5 megabytes