# init(withResolvers:mappingTransform:) Declares support for the `contains` operator between a `String?` property and user-supplied values. ``` init(@ResolverSpecificationBuilder withResolvers resolvers: @escaping () -> Spec, mappingTransform: @escaping (InputType) -> ComparatorMappingType) where PropertyType : ExpressibleByNilLiteral, InputType == String, Spec : ResolverSpecification, PropertyType.UnwrappedType == String ``` ## Parameters `resolvers` Set of `Resolver`s to apply when converting user input to the target `Value` type. `mappingTransform` Closure that transforms the user-supplied value into the `ComparatorMappingType` output type. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)