I know I can insert NSManagedObject into a context with the following code

NSManagedObjectContext *context = [self managedObjectContext];

NSManagedObject *object = [NSEntityDescription insertNewObjectForEntityForName:@”Object” inManagedObjectContext:context];

[object setValue:@”george” forKey:@”name”];

But there is something I do not understand : if that context is bound to a NSArrayController, it seems that calling insertNewObjectForEntityForName:inManagedObjectContext sometimes inserts the object into the array and sometimes not…

Could anyone tell why ?

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Please provide more details on how you have your array controller configured. One thing I will say is that, unless you’re calling the array controller’s -add: method directly, you (often) need to tell the array controller to -fetch: to refresh its result set.