QueryModifier

RestKit allows to handle requests and do some custom querying via QueryModifier

QueryModifier takes a Request and QueryBuilder for controller resource model and allows to make some modifications to the QueryBuilder.

For example:

Extract sort and filter query paramers and apply sorting and filtering to the query builder
Extract include parameters and apply EagerLoader for the query builder

All this is already done in RestKit's Sorting, Filtering, and EagerLoading.

QueryModifiers can be combined together with &

struct StarController {
    func index(req: Request) throws -> EventLoopFuture<CursorPage<Star.Output>> {
        try ResourceController<Star.Output>().getCursorPage(
            req: req,
            queryModifier: 
                .eagerLoading(StarEagerLoadingKeys.self) &
                .sort(using: StarsSortingKeys.self) &
                .filter(StarsFilterKeys.self)
        )
    }
}