Secondary Keys

UNLOCK NEW RELATIONSHIPS

Secondary Keys let components reference Entities or Objects, enabling powerful relationship patterns!

What are Secondary Keys?

fennecs allows component types, which act as primary keys, to also reference an additional secondary key. This enables rich relationship modeling between entities and objects.

Quick Reference

Key Type	Description	Use Case
Plain Component	No secondary key	Standard component data
Relation	Target is an Entity	Entity-to-Entity relationships
Object Link	Target is an Object	Entity-to-Object associations

Key Types

Secondary keys may be:

• Nothing - a Plain Component with no secondary key
• Entity - designating the component as a Relation to the target Entity
• Object - constituting an Object Link to a reference type

Wildcards

Wildcard Match Expressions (Match.Any, Match.Target, Entity.Any, Link.Any) match whole categories of secondary keys – in Queries, and also in Remove<C>(Match) to strip all matching components in one structural change.