---
title: NSManagedObjectContextQueryGenerationKey
framework: coredata
role: symbol
role_heading: Global Variable
path: coredata/nsmanagedobjectcontextquerygenerationkey
---

# NSManagedObjectContextQueryGenerationKey

Constant used to reference the query generation token.

## Declaration

```swift
let NSManagedObjectContextQueryGenerationKey: String
```

## See Also

### Managing concurrency

- [mergeChanges(fromRemoteContextSave:into:)](coredata/nsmanagedobjectcontext/mergechanges(fromremotecontextsave:into:).md)
- [automaticallyMergesChangesFromParent](coredata/nsmanagedobjectcontext/automaticallymergeschangesfromparent.md)
- [concurrencyType](coredata/nsmanagedobjectcontext/concurrencytype-swift.property.md)
- [mergePolicy](coredata/nsmanagedobjectcontext/mergepolicy.md)
- [queryGenerationToken](coredata/nsmanagedobjectcontext/querygenerationtoken.md)
- [transactionAuthor](coredata/nsmanagedobjectcontext/transactionauthor.md)
- [mergeChanges(fromContextDidSave:)](coredata/nsmanagedobjectcontext/mergechanges(fromcontextdidsave:).md)
- [setQueryGenerationFrom(_:)](coredata/nsmanagedobjectcontext/setquerygenerationfrom(_:).md)