That's one of the few methods which are safe. I don't think the docs ever state
it, but it was mentioned in a WWDC session a few years ago
Mike.
Sent from my iPhone
> On 26 Mar 2016, at 18:48, Ryan Meisters <ryanmeist...@gmail.com> wrote:
>
> Hi!
>
> I've inherited a codebase which uses MagicalRecord extensively. It seems that
> the recommended pattern for saving with MagicalRecord is something like this:
>
> [MagicalRecord saveWithBlock:^(NSManagedObjectContext *backgroundContext){
> Person *backgroundPerson = [mainThreadPerson
> MR_inContext:backgroundContext];
> backgroundPerson.firstName = @"John”;
> backgroundPerson.lastName = @"Appleseed";
> }];
>
> The MagicalRecord documentation states that the save block will always run on
> a background thread. So `mainThreadPerson`, which is captured from the
> surrounding scope is used from the backgrond thread to access the objectID.
>
> Is this ok? I believe the answer is no. The Core Data Programming Guide says:
>
> "NSManagedObject instances are not intended to be passed between queues.
> Doing so can result in corruption of the data and termination of the
> application. When it is necessary to hand off a managed object reference from
> one queue to another, it must be done through NSManagedObjectID instances."
>
> The author or this github issue
> https://github.com/magicalpanda/MagicalRecord/issues/448 raises the same
> concern. The basically says it's ok becuase "we're not accessing any Core
> Data properties at this point, we're accessing a ObjectID".
>
> Is this really ok?
>
>
> Kind Regards,
> Ryan
> _______________________________________________
>
> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
> https://lists.apple.com/mailman/options/cocoa-dev/mabdullah%40karelia.com
>
> This email sent to mabdul...@karelia.com
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
