---
title: unique
framework: swiftdata
role: symbol
role_heading: Type Property
path: swiftdata/schema/attribute/option/unique
---

# unique

Ensures the property’s value is unique across all models of the same type.

## Declaration

```swift
static var unique: Schema.Attribute.Option { get }
```

## Mentioned in

Syncing model data across a person’s devices

## See Also

### Accessing property options

- [allowsCloudEncryption](swiftdata/schema/attribute/option/allowscloudencryption.md)
- [externalStorage](swiftdata/schema/attribute/option/externalstorage.md)
- [preserveValueOnDeletion](swiftdata/schema/attribute/option/preservevalueondeletion.md)
- [spotlight](swiftdata/schema/attribute/option/spotlight.md)
- [transformable(by:)](swiftdata/schema/attribute/option/transformable(by:)-9d4xh.md)
- [transformable(by:)](swiftdata/schema/attribute/option/transformable(by:)-lunz.md)
- [ephemeral](swiftdata/schema/attribute/option/ephemeral.md)
- [codable](swiftdata/schema/attribute/option/codable.md)