debian-mirror-gitlab/doc/development/issuable-like-models.md

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---
stage: Plan
group: Project Management
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
---
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# Issuable-like Rails models utilities
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GitLab Rails codebase contains several models that hold common functionality and behave similarly to
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[Issues](../user/project/issues/index.md). Other examples of "issuables"
are [Merge Requests](../user/project/merge_requests/index.md) and
[Epics](../user/group/epics/index.md).
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This guide accumulates guidelines on working with such Rails models.
## Important text fields
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There are maximum length constraints for the most important text fields for issuables:
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- `title`: 255 characters
- `title_html`: 800 characters
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- `description`: 1 megabyte
- `description_html`: 5 megabytes