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# willRemoveCacheNodes(_:)

Method invoked before the store removes the given collection of cache nodes.

```
func willRemoveCacheNodes(_ cacheNodes: Set<NSAtomicStoreCacheNode>)
```

## Parameters

`cacheNodes`

The set of cache nodes to remove.

## Discussion

This method is invoked by the store before the call to [`save()`](/documentation/CoreData/NSAtomicStore/save()) with the collection of cache nodes marked as deleted by a managed object context.  You can override this method to track the nodes which will not be made persistent in the [`save()`](/documentation/CoreData/NSAtomicStore/save()) method.

You should not invoke this method directly in a subclass.

## See Also

[`-  save:`](/documentation/CoreData/NSAtomicStore/save())

Saves the cache nodes.


---

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