Core Data Fetch Invariance
Objects in a persistent store are unordered. If I fetch the objects, change nothing in the store, then fetch them again, do the two fetches give me the objects in the same order? --Richard ___ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Core Data Fetch Invariance
On Dec 26, 2009, at 9:38 AM, Richard Somers wrote: Objects in a persistent store are unordered. If I fetch the objects, change nothing in the store, then fetch them again, do the two fetches give me the objects in the same order? Maybe. Behavior is undefined. b.bum ___ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Core Data Fetch Invariance
Your first comment was correct; they are unordered. The fact that they may come back in the same order is not guaranteed by the API. Therefore, if you need ordering, add an attribute to the core data object to do so. Greg On Dec 27, 2009, at 1:38 AM, Richard Somers wrote: Objects in a persistent store are unordered. If I fetch the objects, change nothing in the store, then fetch them again, do the two fetches give me the objects in the same order? --Richard ___ 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: http://lists.apple.com/mailman/options/cocoa-dev/gdr3941%40mac.com This email sent to gdr3...@mac.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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
