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Re: Document style programming
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Re: Document style programming


  • Subject: Re: Document style programming
  • From: Mike Abdullah <email@hidden>
  • Date: Sat, 18 Oct 2014 17:03:32 +0100

When using NSPersistentDocument it takes over responsibility for saving the context. You should not save the context yourself.

> On 18 Oct 2014, at 17:00, Luther Baker <email@hidden> wrote:
>
> Hi,
>
> I am creating a Desktop issue tracking app using core data and the
> NSDocument framework - so yes, the Xcode wizard extended
> NSPersistentDocument which provides me with an NSManagedObjectContext.
>
> My question is - if I start working in the app, creating issues for
> instance ... when I go to actually persist the context I get an error "This
> NSPersistentStoreCoordinator has no persistent stores.  It cannot perform a
> save operation."
>
> So, does this imply that for NSDocument style programming, most folks
> aren't 'saving' their context right away? Do we wait for the user to
> actually save the document the first time? IE: there is not in memory store
> that the Document manages until the user formally saves to the file system?
>
> And does it follow then that on subsequent changes, we formally persist the
> context only when the user actually 'Saves'?
>
> Does anyone force the user to 'find' a file location right away, upon
> opening a new document, and then persist everything happily in the
> background?
>
> I tend to this this is really just a Desktop paradigm question more than
> anything else.

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