Primitives

The handful of domain objects that show up everywhere in GitLab. If you're modifying core code, you'll touch these.

Primitive	Page
User	User
Namespace	Namespace
Project	Project
Group	Group
Repository	Repository
Issuable	Issuable
Member	Member

Why "primitives"

These types are referenced in dozens of services, GraphQL types, REST endpoints, and policies. Their public API stability is critical — a refactor of Project is a multi-month engineering project.

The pages here cover the surface contract, key associations, and the cross-cutting modules that extend them.