Question

Xcode sets syncable="YES" by default for entities & properties, e.g.,

$ cat AppName/AppName.xcdatamodeld/AppName.xcdatamodel/contents
...
<entity name="Event" representedClassName="Event" syncable="YES">
    <attribute name="timestamp" attributeType="Date" syncable="YES"/>
</entity>
...

Should I set syncable to NO? (I know I can do so by deleting syncable="YES" from the contents file or by adding the key-value pair {com.apple.syncservices.Syncable, NO} under the User Info section of the Data Model inspector.)

Answer 1

Yes, set syncable to NO because MobileMe syncing support is deprecated. See “Editing Core Data Models” of the Xcode 4.4 Release Notes:

Editing Core Data Models

• MobileMe syncing support is deprecated. However, the syncable property is still set to YES by default in the User Info Dictionary for entities and properties, but the model editor doesn’t show this setting. 10787672

To explicitly set syncable to NO for an entity or a property, add a key/value pair in your User Info Dictionary:

1. Select the entity or property for which you want to turn off synching on a model file.

2. In the User Info section in the Data Model inspector, add this key/value pair:

   • key – “com.apple.syncservices.Syncable”
   • value – “No”