Subclasses should override this method to customize a fetch request, for example to specify fetch limits.
- macOS 10.4+
The fetch request to use for the fetch. Pass
nilto use the default fetch request.
true, the receiver merges the existing content with the fetch result, otherwise the receiver replaces the entire content with the fetch result.
If an error occurs, upon return contains an
NSErrorobject that describes the problem.
true if the fetch completed successfully, otherwise
This method performs a number of actions that you cannot reproduce. To customize this method, you should therefore create your own fetch request and then invoke
super’s implementation with the new fetch request.