---
title: NSMergeByPropertyStoreTrumpMergePolicy
framework: coredata
role: symbol
role_heading: Global Variable
path: coredata/nsmergebypropertystoretrumpmergepolicy
---

# NSMergeByPropertyStoreTrumpMergePolicy

A property-based merge policy that applies external changes.

## Declaration

```swift
var NSMergeByPropertyStoreTrumpMergePolicy: AnyObject
```

## Discussion

Discussion A policy that merges conflicts between the persistent store’s version of the object and the current in-memory version by individual property, with external changes trumping in-memory changes.

## See Also

### Policies

- [NSErrorMergePolicy](coredata/nserrormergepolicy.md)
- [NSMergeByPropertyObjectTrumpMergePolicy](coredata/nsmergebypropertyobjecttrumpmergepolicy.md)
- [NSOverwriteMergePolicy](coredata/nsoverwritemergepolicy.md)
- [NSRollbackMergePolicy](coredata/nsrollbackmergepolicy.md)
- [NSMergePolicyType](coredata/nsmergepolicytype.md)