On May 1, 2015, at 14:02:27, Sean McBride <[email protected]> wrote:

> In my NSPersistentDocument subclass I created a new initializer, which 
> stripped of error checking, is basically:
> 
> - (instancetype)initWithTemplate
> {
>       self = [super init];
> 
>       [self readFromURL:<hidden file in my .app>
>                                                                   
> ofType:@"com.rogue-research.foobar"
>                                                                    
> error:&error];
>  [self setFileURL:nil]; // seems to change nothing
> 
>  return self;
> }
> 
> Indeed I get what looks like a new/untitled document and it has the correct 
> contents from the template file.  When I save I get a save panel and supply a 
> filename for example on the Desktop but then it tries to save to my template 
> anyway with an exception:
> 
> NSUnderlyingException = "Cannot update objects into a read only store.";
> 
> readFromURL: seems to have added my template as a persistent store in the 
> persistent store coordinator. :(

What happens with the doc after initWithTemplate? Are standard document or doc 
controller methods acting on it? Try overriding setFileURL: (or just set a 
symbolic breakpoint on it) so you can see if something is setting the url after 
your initWithTemplate method. Or try calling setFileURL before readFromURL.

--
Steve Mills
Drummer, Mac geek


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