Normal query filters are applied to fields. Predicates overcome this limitation and can filter on any raw SQL predicate.

The behaviour of predicates must be mapped, then they can be called with a @, the predicate name and zero or more arguments.

@search 'peter', @updated, @tags 'island' 'fun'

Predicates can refer to a dependency, using a path.

To search a dependency address use

@address_search 'peter'