# Schema.Unique ``` final class Unique where T : PersistentModel ``` ## Topics ### Initializers [`init([PartialKeyPath]...)`](/documentation/SwiftData/Schema/Unique/init(_:)) ### Instance Properties [`let constraints: [[PartialKeyPath]]`](/documentation/SwiftData/Schema/Unique/constraints) ### Enumerations [`enum CodingKeys`](/documentation/SwiftData/Schema/Unique/CodingKeys) ## Relationships ### Conforms To [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`Encodable`](/documentation/Swift/Encodable) [`Decodable`](/documentation/Swift/Decodable) [`SchemaProperty`](/documentation/SwiftData/SchemaProperty) [`Equatable`](/documentation/Swift/Equatable) [`Hashable`](/documentation/Swift/Hashable) --- 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)