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# setMetadata(_:for:)

Updates the metadata for the specified persistent store.

```
func setMetadata(_ metadata: [String : Any]?, for store: NSPersistentStore)
```

## Parameters

`metadata`

A dictionary containing metadata for the store.

`store`

A persistent store.

## Discussion

The store type and UUID (`NSStoreTypeKey` and `NSStoreUUIDKey`) are always added automatically, however `NSStoreUUIDKey` is only added if it is not set manually as part of the dictionary argument.

> Important:
> Setting the metadata for a store does not change the information on disk until the store is actually saved.

## See Also

[`+  setMetadata:forPersistentStoreOfType:URL:error:`](/documentation/CoreData/NSPersistentStoreCoordinator/setMetadata(_:forPersistentStoreOfType:at:))

Sets the metadata for a given store.

[`+  metadataForPersistentStoreOfType:URL:error:`](/documentation/CoreData/NSPersistentStoreCoordinator/metadataForPersistentStore(ofType:at:))

Returns a dictionary containing the metadata stored in the persistent store at a given URL.


---

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