I have a core data master-detail interface that consists of a
sourcelist on the left and a tableview.
The source list displays object from a core data entity. THe table
view will be populated by a custom datasource as I have to do some
data munging on the way from core data to the tableview. My custom
controller (datasource) is based on NSObject and has the standard
tableview delegate methods.
The tableview is also populated based on the selected item in the
source list. So I've setup a notification from the outlineview to call
a method in my custom controller. This works fine and when I execute
it I'm trying to get the outlineview's treecontrollers selection like
so;
NSString *accountName = @"default"; //set initial string value
NSLog(accountName); // check logging
object = [MLoutlineViewController selection]; //get selection object
from treecontroller (proxy of core data entity)
accountName = [object valueForKey:@"name"]; //get name property from
object
The object being returned from the selection is always NULL.
Console shows the following;
2008-05-19 22:25:46.990 moolahcoredata[664:10b] Cannot perform
operation without a managed object context
2008-05-19 22:25:46.996 moolahcoredata[664:10b] default
Now, I know the context error is probably because the outlineview
starts up with an item selected, probably before core data is
initialised properly. I've also read that every controller has to have
the context bound. My controller is based on NSObject, it doesn't have
bindings and I'd rather do things programmatically just now. Do I need
to somehow use the context to get the selection? If so, how? I know
context is needed for adding, fetching etc but to get an object from a
treecontroller? I don't think so somehow.
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