Building Addons

You can ship a separate plugin or theme that uses and extends Native Content Relationships.

Requirements

• Native Content Relationships installed and active.
• Use the public PHP API, WP_Query, and hooks.
• Register custom types with ncr_register_relation_type.

Checklist

1. Dependency check — Ensure NCR is loaded (e.g. class_exists( 'NATICORE_Relation_Types' ) or function_exists( 'ncr_add_relation' )) before calling its API.
2. Relation types — Register your types on init (priority 20 or later) so they appear in admin and in queries.
3. Hooks — Use ncr_relation_added / ncr_relation_removed for side effects (e.g. cache invalidation, sync to another system).
4. Filters — Use ncr_get_related_args or ncr_max_relationships to adjust behavior without forking the plugin.

Distribution

• Do not bundle or rename the main plugin; require it as a dependency and document it in your readme.
• Follow WordPress plugin guidelines and the Stability & Backward Compatibility notes when relying on specific API shapes.

See Extension hooks for additional integration points.