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# ModelConfiguration

A type that describes the configuration of an app’s schema or specific group of models.

```
struct ModelConfiguration
```

## Topics

### Creating a model configuration

[`init(isStoredInMemoryOnly:)`](/documentation/SwiftData/ModelConfiguration/init(isStoredInMemoryOnly:))

Creates a basic model configuration.

[`init(for:isStoredInMemoryOnly:)`](/documentation/SwiftData/ModelConfiguration/init(for:isStoredInMemoryOnly:))

Creates a model configuration for the specified model types.

[`init(_:schema:isStoredInMemoryOnly:allowsSave:groupContainer:cloudKitDatabase:)`](/documentation/SwiftData/ModelConfiguration/init(_:schema:isStoredInMemoryOnly:allowsSave:groupContainer:cloudKitDatabase:))

Creates a named model configuration for the specified schema.

[`init(_:schema:url:allowsSave:cloudKitDatabase:)`](/documentation/SwiftData/ModelConfiguration/init(_:schema:url:allowsSave:cloudKitDatabase:))

Creates a named model configuration that specifies the on-disk location of the
schema’s persistent storage.

### Accessing configuration details

[`url`](/documentation/SwiftData/ModelConfiguration/url)

The on-disk location of the schema’s persistent storage.

[`allowsSave`](/documentation/SwiftData/ModelConfiguration/allowsSave)

A Boolean value that determines whether the associated persistent storage is
writable.

[`isStoredInMemoryOnly`](/documentation/SwiftData/ModelConfiguration/isStoredInMemoryOnly)

A Boolean value that determines whether the associated persistent storage is
ephemeral and exists only in memory.

### Managing schema information

### Sharing and syncing the model store

[`cloudKitContainerIdentifier`](/documentation/SwiftData/ModelConfiguration/cloudKitContainerIdentifier)

The identifier of the configuration’s CloudKit database container.

[`cloudKitDatabase`](/documentation/SwiftData/ModelConfiguration/cloudKitDatabase-swift.property)

The option to use when detecting the container of the preferred CloudKit
database.

[`ModelConfiguration.CloudKitDatabase`](/documentation/SwiftData/ModelConfiguration/CloudKitDatabase-swift.struct)

A type that describes the options for detecting a CloudKit database.

[`groupAppContainerIdentifier`](/documentation/SwiftData/ModelConfiguration/groupAppContainerIdentifier)

The identifier of the configuration’s app group container.

[`groupContainer`](/documentation/SwiftData/ModelConfiguration/groupContainer-swift.property)

The option to use when detecting the preferred app group container.

[`ModelConfiguration.GroupContainer`](/documentation/SwiftData/ModelConfiguration/GroupContainer-swift.struct)

A type that describes the options for detecting an app group container.

### Hashing

### Comparing model configurations


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