EOValueMerging

Declared in: EOControl/EOClassDescription.h

Instance Methods

Merging values

- changesFromSnapshot:

- reapplyChangesFromDictionary:

changesFromSnapshot:

The result is like a snapshot except that it contains only those keys that refer to uncommitted changes in the object relative to the given snapshot. For to-many keys, the uncommitted value is an array of two arrays: uncommitted additions and uncommitted deletions. The return value is autoreleased.

reapplyChangesFromDictionary:

Similar to takeValuesFromDictionary: but the changes dictionary is not quite the same as a snapshot. For to-many relationship keys, the value is an array with exactly two arrays in it: the first is an array of objects to be added to the relation, and the second is an array of objects to be removed from the relation. Attribute and to-one relationship keys refer to values that should replace the current value. An instance of EONull is used in the changes dictionary as a placeholder for nil.