Dear list
I'm just getting started with Cocoa and Obj-C. I've done a little bit
of Java in the past but mainly I'm a tcl scripter. Apologies for the
wordiness of the following.
I've been following some of the tutorials and so far have been pretty
successful at finding the bugs I've introduced, except this one:-
In the NSPersistentDocument Core Data Tutorial, I have had the thing
working all the way until I added the Department - now the interface
all works as expected but I cannot save my data anymore. If I invoke
the File -> Save As option and enter a filename the file doesn't save
but I get the following logged in the Debugger Console:-
2008-03-16 19:25:43.070 DepartmentAndEmployees[6368:10b] Cannot
perform operation since entity with name '(null)' cannot be found
However, If I open a file saved by a previous version, before the
Department entity was added, I can now define my Department, add
Employees and successfully save the data. (I had to amend the
department accessor method to make it create a new Department if it
was unable to fetch one but that seems to work OK).
So, it seems to me that I've got the UI wired up correctly since it
works if I can use a document which was successfully saved and I
should be looking in my code for a bug. But I don't know where to
start to debug this - I can't find a suitable place to add a
breakpoint to enter the debugger during the file save routine. Is this
the time for me to find out about Instruments?
Many thanks
Neil
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