Re: Should I learn CoreData for this project?
On 04.11.2009, at 12:15, Kai Brüning wrote: >> 2. multithreaded core data is very hard to get right (multiple contexts, >> data merges) > > Isn’t this true for multi threaded code in general? > Seriously, the documentation explains how to structure multi threaded use of > Core Data. This might even save you some pitfalls compared with a "naive" > approach to multi-threading a model. True, but as I found out the hard way, using Core Data multithreaded and Bindings at the same time is a very bad idea and will lead you into a world of pain. Or as the documentation cautiously puts it: "For the most part, the Application Kit is not thread safe; in particular, Cocoa bindings and controllers are not thread safe—if you are using these technologies, multi-threading may be complex." Ruotger ___ 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: Should I learn CoreData for this project?
more disadvantages to mention: 1. schema updates with every model change if you use an sql store (you have to make a mapping for every single from version/ to version combination you need to support) 2. multithreaded core data is very hard to get right (multiple contexts, data merges) 3. performance tuning of core data often means making your schema more complex (see also point 1) 4. debugging core data can be hard (most bugs only get to the surface when you try to save your data). 5. core data throws exceptions all over the place so you may end up with a try-catch block with every data access in your code If your data set fits in memory and you don't mind loading it all at once, stay away from core data. my two cents Ruotger On 04.11.2009, at 08:54, Kai Brüning wrote: Hi David, this question is most definitely on topic :-) So, lets see, what would Core Data give you: - Scalability, fast incremental loads and saves for big data sets. I don’t think you’ll need this. Loading and saving 500 items each time will be fast enough. - A data model modeler. That’s actually more valuable then it may seem on first glance. I often look at my Core Data models when thinking about algorithms and want to recap how the object graph looks. - Automatic and semi-automatic version migration. Depends on the lifecycle of your application. When needed, it’ll save you tons of time. - Object graph consistency management. A big one. Core Data automatically updates inverse relationships as needed. A lot of work to do manually, and always a source of subtle bugs. - Automatic undo support. Big - Disadvantage: Core Data does not support ordered relationships. That is, it uses sets instead of arrays. If you need an order, you have to manage this yourself. Not hard, but sometimes an annoyance (the reason for this "shortcoming" are hard technical problems). That’s it out of my head. I’m sure I forgot something. The learning effort? Hard to say. Core Data is well documented and works (almost always) as advertised. So it depends on how well you learn new abstractions. One unrelated advice: by all means use garbage collection. It makes object graph management (and a lot of other things) so much easier, no matter whether you use Core Data or not. Good luck! Kai On 4.11.2009, at 05:22, David Hirsch wrote: So, I'm hearing folks sing the praises of CoreData, which I have not yet learned. It seems like a long uphill climb, but if life will be spectacular afterwards, I'll do it. I am a semi-casual programmer; I've just finished a couple of small programs that do not use CoreData, and I can see the advantage in gaining open/save and undo/redo for free, but I'm concerned about the work I'll have to put in to learn it. I've read a bunch of the CoreData intro documentation, but it doesn't give a feel for how difficult it will be to learn, nor how big the advantages are if I do. Here's the next project I'm going to work on, for which I'm considering CoreData: A simulated annealing code for class scheduling. The CoreData part would lie in managing all the lists involved: classes, rooms, instructors, preferences, conflict cost weights, etc. I estimate that I will have about 500 items spread over about 10 arrays. I would not expect to have a complex object graph (if that's the right term) - just a lot of items in lists, items that need to be managed, displayed, saved, loaded, etc. I could use NSArrays for all these, which I currently understand. Does this sound like it's worth learning CoreData for? Thanks, Dave S.A.: I hope this is on topic; I think it is. Those recent projects I mentioned: http://almandine.geol.wwu.edu/~dave/research/code/ModeMaker/ http://almandine.geol.wwu.edu/~dave/research/code/ModeQuiz/ Dave Hirsch Associate Professor Department of Geology Western Washington University persistent email: dhir...@mac.com http://www.davehirsch.com voice: (360) 389-3583 aim: dhir...@mac.com vCard: http://almandine.geol.wwu.edu/~dave/personal/DaveHirsch.vcf ___ 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/lists%40kai-bruening.de This email sent to li...@kai-bruening.de ___ 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/lists%40chipmunk-app.com This email sent to li...@chipmunk-app.com
Re: "Could not merge data"-error on save in a single moc app
On 29.10.2009, at 20:05, Ben Trumbull wrote: I get a "Could not merge changes"-error on save in a single moc app (*). The docs state this is a problem of a multi-moc setup: http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/Articles/cdTroubleshooting.html Yes, the MOC you are saving refers to data that has changed out from underneath it in either the PSC or the database file itself. This is an optimistic concurrency control failure. The error does not appear on every system and seems to be related to when save is called. (race condition?) So far I only have users complaining that run Mac OS 10.6. I can rarely reproduce the error myself. Any pointers where to look? Well, you can break on -[NSManagedObjectContext init], and -save: to see if you really only have 1 MOC. Other than that, breaking on + [NSError errorWithDomain:code:userInfo:] and doing "thread apply all bt" in gdb is usually helpful. I use garbage collection. regards Ruotger (*) the context is handed out by a singleton method. I NSAssert() this method is only called by the main thread. Well, it's still possible for code to leak it to another thread if, you say, pass NSManagedObjects around, and then ask them for their MOC. - Ben Hi, I've checked all accesses to the moc and by using mogenerator I generated files that assert that every single access of a managed object is on the main thread. I still get the "Could not merge data"- error or sometimes this one: Printing description of error: Error Domain=NSCocoaErrorDomain Code=1550 UserInfo=0x5d45490 "balances is not valid." balances is a one-way to multiple relation. Any more ideas? regards Ruotger ___ 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
"Could not merge data"-error on save in a single moc app
Hi, I get a "Could not merge changes"-error on save in a single moc app (*). The docs state this is a problem of a multi-moc setup: http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/Articles/cdTroubleshooting.html The error does not appear on every system and seems to be related to when save is called. (race condition?) So far I only have users complaining that run Mac OS 10.6. I can rarely reproduce the error myself. Any pointers where to look? I use garbage collection. regards Ruotger (*) the context is handed out by a singleton method. I NSAssert() this method is only called by the main thread. I have seen horses puke in front of a pharmacy ___ 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 dog-slow when using first time after boot
Am 26.08.2009 um 01:21 schrieb Ben Trumbull:
When I use setRelationshipKeyPathsForPrefetching the fetch throws:
-[NSSQLAttribute inverseRelationship]: unrecognized selector sent
to instance 0x10ee150
Can you provide the entire stack trace at this point ? gdb use
future-break objc_exception_throw
Thanks. What is the actual set of keypaths you set in the fetch
request ? setRelationshipKeyPathsForPrefetching expects all the
keypaths to terminate in a relationship object, not the attribute
off that related object.
Yes, that was the problem.
|-|
| Transaction |
|-| ||
|net | --> | Amount | <<-- (one other entity)
|gross| --> ||
|fee | --> |value | <<-
|account | <<- |currency||
|... |||||
|-|| |
| |
-- |
| |
||| |
|| Account| |
||| |
||balances| --
--> |transactions|
|... |
||
So basically I use Amount only as a container for a currency
descriptor and a value. I would have to model 7 inverse
relationships on that entity to make all relationships two-way.
Hmm. I'd recommend consider whether or not it makes sense to de-
normalize Amount into Transaction instead of making it a separate
entity. I assume the net/gross/fee are all going to be in the same
currency, yes ? Amount is very fine grained, and not (apparently)
offering very much value for the abstraction cost.
Will do that. At least for the amounts in Transaction.
Since it's not a many to many, you can perform the prefetching
effectively by hand using a fetch request to preload the relevant
destination rows with an IN query based on the data you initially
fetched for the source entity. You shouldn't have to, but if
you've run into a bug, that's how you could workaround it.
You still haven't described the NSPredicate you were using with
filteredArrayUsingPredicate. Being more forthcoming about the
context and details of your problem will help us get you answers
more quickly.
This is the predicate I was using for the test of the original
post, but since I use Smart Folders predicates can look a lot
different (i.e.: complex):
(additionalInfo.onTheFlyIsInternal == 0 AND
additionalInfo.isSuppressed != 1) AND (account.uniqueID IN
{"D1AB3788-00DF-4475-A979-CE3EFC3987B5"} OR FALSEPREDICATE)
You'll want to prefetch additionalInfo and account.
Hm. Problem here is: As mentioned I use the predicate for a smart
group. So the predicate can vary wildly and can reference basically
any entity in the model. So what is the best strategy here?
"Decompile" the predicate (which is built by an NSPredicateEditor) and
prefetch the keypaths it takes? Prefetch "everything"?
Kind Regards
Ruotger
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Re: Core Data dog-slow when using first time after boot
Am 24.08.2009 um 23:13 schrieb Ben Trumbull:
When I use setRelationshipKeyPathsForPrefetching the fetch throws:
-[NSSQLAttribute inverseRelationship]: unrecognized selector sent
to instance 0x10ee150
Can you provide the entire stack trace at this point ? gdb use
future-break objc_exception_throw
#0 0x97503f26 in objc_exception_throw ()
#1 0x944279db in -[NSObject(NSObject) doesNotRecognizeSelector:] ()
#2 0x94383026 in ___forwarding___ ()
#3 0x94382bf2 in __forwarding_prep_0___ ()
#4 0x97b3acae in -[NSSQLCore
_prefetchRelationshipKey:sourceEntityDescription:sourceObjectIDs:prefetchRelationshipKeys:inContext
:] ()
#5 0x97b3ab87 in -[NSSQLCore
_prefetchWithFetchRequest:withObjectIDs:inContext:] ()
#6 0x97b3d159 in -[NSSQLCore
_prefetchRelationshipKey:sourceEntityDescription:sourceObjectIDs:prefetchRelationshipKeys:inContext
:] ()
#7 0x97b3ab87 in -[NSSQLCore
_prefetchWithFetchRequest:withObjectIDs:inContext:] ()
#8 0x97b2c106 in newFetchedRowsForFetchPlan_MT ()
#9 0x97b164e7 in -[NSSQLCore newRowsForFetchPlan:] ()
#10 0x97b15d75 in -[NSSQLCore objectsForFetchRequest:inContext:] ()
#11 0x97b15991 in -[NSSQLCore executeRequest:withContext:] ()
#12 0x97b14ae1 in -[NSPersistentStoreCoordinator(_NSInternalMethods)
executeRequest:withContext:] ()
#13 0x97b11fff in -[NSManagedObjectContext executeFetchRequest:error:]
()
#14 0x00010b6e in +[GPPayPalTransaction
transactionsWithPredicate:sortDescriptors:returnObjectsAsFaults:relationshipKeyPathsForPrefetching:inManagedObjectContext:error
:] (self=0x10ebd4, _cmd=0x6a180, inPredicate=0x0,
inSortDescriptors=0x10adb80, inAsFaults=0 '\000',
inPrefetchKeyPaths=0x10ff990, inContext=0x10ad7e0,
outError=0xbfffe73c) at /Users/roddi/Development/GaragePay/
GPPayPalTransaction.m:100
(this is 10A432)
For the record: I do use one-way relationships
That should be okay as long as you're not pretending to use a no
inverse to-many relationship as a de facto many to many
relationship. No inverse relationships can only behave as if the
inverse were to-one. Specifically, each row in the destination
entity may only be associated with a single row in the source entity
if the relationship on the source entity does not have an inverse.
(e.g. you only get join tables in fully modeled bi-directional
relationships)
Do I understand that correctly? No two (or more) Accounts or
Transactions should "point" to the same Amount (see simplified
schema). Unless there's a bug somewhere that's not the case.
|-|
| Transaction |
|-| ||
|net | --> | Amount | <<-- (one other entity)
|gross| --> ||
|fee | --> |value | <<-
|account | <<- |currency||
|... |||||
|-|| |
| |
-- |
| |
||| |
|| Account| |
||| |
||balances| --
--> |transactions|
|... |
||
So basically I use Amount only as a container for a currency
descriptor and a value. I would have to model 7 inverse relationships
on that entity to make all relationships two-way.
Since it's not a many to many, you can perform the prefetching
effectively by hand using a fetch request to preload the relevant
destination rows with an IN query based on the data you initially
fetched for the source entity. You shouldn't have to, but if you've
run into a bug, that's how you could workaround it.
You still haven't described the NSPredicate you were using with
filteredArrayUsingPredicate. Being more forthcoming about the
context and details of your problem will help us get you answers
more quickly.
This is the predicate I was using for the test of the original post,
but since I use Smart Folders predicates can look a lot different
(i.e.: complex):
(additionalInfo.onTheFlyIsInternal == 0 AND
additionalInfo.isSuppressed != 1) AND (account.uniqueID IN
{"D1AB3788-00DF-4475-A979-CE3EFC3987B5"} OR FALSEPREDICATE)
AdditionalInfo has a one-to-one two-way relationship with Transaction
(not depicted above).
Hope that helps
Ruotger
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Re: Core Data dog-slow when using first time after boot
Am 20.08.2009 um 22:28 schrieb Ben Trumbull: setRelationshipKeyPathsForPrefetching When I use setRelationshipKeyPathsForPrefetching the fetch throws: -[NSSQLAttribute inverseRelationship]: unrecognized selector sent to instance 0x10ee150 For the record: I do use one-way relationships Ruotger ___ 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 dog-slow when using first time after boot
Am 20.08.2009 um 11:34 schrieb Ruotger Skupin: Am 19.08.2009 um 22:00 schrieb Ben Trumbull: I debugged it with some Snow Leopard magic and found out, that firing faults is very slow the first time after boot. When I use -[NSArray filteredArrayUsingPredicate:] the fault firing is killing me. What's the predicate you are using ? I'm not using a predicate for the first fetch. (Ok, I have learned now, I should do so.) You're almost certainly filtering in memory after fetching only a subset of the data needed to perform your in memory filtering (specifically, only the source entity and not its relationships). Yes I do some on-the-fly filtering which depends on other objects. (Ok, lesson learned: Bad idea) Since you didn't fetch the related objects, Core Data goes and retrieves them on demand. However, mind reading is technically challenging, and Plan B, retrieving the related objects one at a time, is a rather inefficient I/O pattern. It would be vastly faster to filter the data in the database using a predicate on the fetch request. So, would it be better to perform the on-the-fly filtering calculation every time the object changes and put flags in the root object? Then fetch with a predicate testing these flags? Probably. (model change! yay!) If that's not possible, then you should use a fetch request predicate that approximates what you need, and filter those results more precisely in memory. That's what I'm doing now because the most common use case is: I need almost everything. So the approximation is: I fetch everything and filter out some objects. Like a bounding rect in views. If you have already fetched the objects, but want to identity different subsets, you can use objectID fetch results to simply identify the matching objects without pulling back all the row data. The subsets depend on the data of the objects. (Smart Folders) Complex locale aware Unicode text queries can be slow. If you find yourself spending time with such a query, you should consider some of the techniques shown in the DerivedProperty example available on ADC. Isn't all text Unicode? I don't understand. This shouldn't be a special case. But I will have a look at the sample. In my case I'd guess that at least half of the objects contain unicode strings (international names and addresses). What I want to say: write anything in German or French and you end up with Unicode. Typically, apps that launch slowly once, and then run quickly afterwards are doing far too much I/O. On successive launches, the kernel has cached most of the data, so instead of doing to-disk I// O the app is doing to-kernel-memory I/O. As stated before I need almost all data anyway. Is there a way to bulk-load the whole database into mem in one go? That's not what sql is about, is it? The most common problem in Core Data apps is when people allow faulting to lazily fetch data one row at a time, even when the app needs all the data immediately. They should prefetch the related objects with the original fetch request by setting the prefetching keypaths. Ok, will try to do that. Another question: I'm using Garbage Collection. Should I look out for something special there? Keep managed objects on purpose? Letting them go as soon as possible? Thanks for the insight Ruotger ___ 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 dog-slow when using first time after boot
Am 20.08.2009 um 04:38 schrieb M Pulis: I got that, Bill, thank you. The OP did not specify what particular sql store (we still do NOT know) nor if he is compiled Universal, has any helper programs, etc, he did however, describe symptoms I have seen with Rosetta. So I simply proposed checking that no PPC code was being engaged. Simple to do. For the record: I compiled Universal (debug version: Intel-only) 32bit- only. No helper programs. So it's pretty save to say, I'm not using Rosetta. Ruotger ___ 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 dog-slow when using first time after boot
Am 19.08.2009 um 19:18 schrieb I. Savant: Hmm ... time to hit the books if you haven't already: http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdPerformance.html#/ /apple_ref/doc/uid/TP40003468 Have you tried anything suggested there? Fetch Limits: Not tried The App basically loads objects and displays them in a table, so I can't fetch only half of them as sorting depends on the contents of the objects. I do fetches with sort descriptors though, to keep sorting time down (always below 0.1 sec). Batch faulting: tried It helps but it is still too slow. Pre-fetching: not tried But if I understand the document right it's just a special case of Batch Faulting and I don't see any faults fired since I use Batch Faulting anyway Reducing Memory Overhead: most don't apply (Garbage Collection / no temporary managed objects) I set the undo manager to nil Large Data Objects (BLOBs): not used I'd say all object are under 1k Would switching to a different store type (other than SQL) help? The database is not that large (in my example 55MB) maybe an atomic store has its advantages there? Ruotger ___ 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 dog-slow when using first time after boot
Am 19.08.2009 um 18:38 schrieb Nick Zitzmann: On Aug 19, 2009, at 4:13 AM, Ruotger Skupin wrote: when fetching about 5000 objects from an sql store, Core Data is very slow the very first time after a boot. When running the app the first time it takes 50 to 90 seconds and when starting it the second time it is well below one second. What is going on here? Has anyone noticed this too? Did you try using Shark to find out why this is happening? According to shark basically nothing plus some time spend in faults. Shark is useless when perf-debugging Core Data. I debugged it with some Snow Leopard magic and found out, that firing faults is very slow the first time after boot. When I use -[NSArray filteredArrayUsingPredicate:] the fault firing is killing me. So I recoded it to fetch everything upfront with [fetchRequest setReturnsObjectsAsFaults:NO]; and the fetching of 5000 objects still takes more than 15 seconds. On second launch that's about 3 seconds. This seems to be slow. Ruotger ___ 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
Core Data dog-slow when using first time after boot
Hi,
when fetching about 5000 objects from an sql store, Core Data is very
slow the very first time after a boot. When running the app the first
time it takes 50 to 90 seconds and when starting it the second time it
is well below one second.
What is going on here? Has anyone noticed this too?
I thought of writing a background app to load the store and fetch the
objects when logging in, just in case the user might launch the app...
But that's madness of course!
I'm talking about Leopard 10.5.7 and 10.5.8 here. Don't know about
Tiger (can't talk about SL)
regards
Ruotger Skupin
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Re: [iPhone] Abort/remove all running/pending animations [SOLVED]
To answer my own question: +[UIView setAnimationsEnabled:]; BUT !!!1!eleven!!one! -[UIScrollView setContentOffset: animated:] messes also with +[UIView setAnimationsEnabled:] whether or not you use animated. So when getting the scrollViewDidEndZooming:withView:atScale: delegate callback call, reorder your content subviews so that the zoomed view stays where it is already and use the contentInset property creatively. Do not use -[UIScrollView setContentOffset: animated:] in that delegate callback call. Hope that helps people running into the same problem Ruotger Am 12.02.2009 um 11:57 schrieb Ruotger Skupin: Hi, I'm resizing and moving the content of a UIScrollView in the - scrollViewDidEndZooming:withView:atScale: method including the removing/adding of views. This usually results in the content bouncing more or less uncontrollable. My question: Is it possible to remove/abort *all* (really all) pending/running animations (especially those in UIScrollView) to reorder all the views and start custom animations from there? Ruotger ___ 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/lists%40chipmunk-app.com This email sent to li...@chipmunk-app.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
Re: Retrieve Default Currency Type in Mac, iPhone
Hi Ben, Be careful with your assumptions. Some Locales have the currency symbol after the number, e.g. German: 1.234,56 € (note the decimal separator between the 4 and the 5 for additional scanning fun!) Roddi Am 16.02.2009 um 12:35 schrieb Ben: I haven't checked the docs, but could you maybe scan the string up to the first numeric character and use that? - Ben On 16 Feb 2009, at 11:30, Tharindu Madushanka wrote: Hi, I want to get the currency type of iPhone default selected language. If I add an NSNumberFormatter and format a number I will get a string with the currency type. But I cannot sub string this and get the currency type since it might vary the character size. When international is selected as United States, For example $ 123,290.00 , I want to get $ mark only. TRY 2.500,00, I want to get TRY only. Can I do this, Please explain me. Thank you, Tharindu ___ 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/lists%40chipmunk-app.com This email sent to li...@chipmunk-app.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
[iPhone] Abort/remove all running/pending animations
Hi, I'm resizing and moving the content of a UIScrollView in the - scrollViewDidEndZooming:withView:atScale: method including the removing/adding of views. This usually results in the content bouncing more or less uncontrollable. My question: Is it possible to remove/abort *all* (really all) pending/running animations (especially those in UIScrollView) to reorder all the views and start custom animations from there? Ruotger ___ 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
UIScrollView - photo viewer like usage
Hi,
this is going to sound like an angry rant but actually it isn't. I'm
simply a bit frustrated...
I have been trying to use UIScrollView to build an Photo app-like
image viewer. The view is supposed to show photos with swiping between
them, zooming and rotating with interface rotation.
It seems this is impossible. When you add more than one subview to
UIScrollView, zooming seems to be broken beyond repair with strange
behaviour all over the place, no control over the subviews while
zooming and weird whizzing of views when the zooming ends. It's hard
to post Radar bugs here, because there is only little documentation of
what should actually happen or what can be done when
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:
(UIView *)view atScale:(float)scale
is called.
So my questions:
Has anyone done this successfully (with UIScrollView)?
Is it better to re-implement all this with layers to have more control
over everything?
To Apple people:
Does it make sense to spend a support incident on this or is it just a
waste of everyone's time.
Regards and no offence meant
Ruotger
P.S.: to see what I mean download the Scrolling sample and add these
methods to MyViewController:
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
CGPoint offset = scrollView.contentOffset;
int imageIndex = (int)(floorf(offset.x / kScrollObjWidth));
if (imageIndex >= 0 && imageIndex < [[scrollView1 subviews] count])
return [[scrollView1 subviews] objectAtIndex:imageIndex];
return nil;
}
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:
(UIView *)view atScale:(float)scale
{
}
// and add this to -[MyViewController viewDidLoad]:
scrollView1.minimumZoomScale = 1;
scrollView1.maximumZoomScale = 3;
scrollView1.delegate = self;
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Comparing the Class
Hi,
when comparing the class of two objects I usually do [obj1
isKindOfClass:[obj2 class]]. But if I say have the Class as an input
value to a method:
- (void) bla:(Class) inClass
{
if (/* inClass is an NSString */)
{
// do stuff
}
else if (/* inClass is an NSNumber */)
{
// do other stuff
}
}
Is it save to compare like this:
inClass == [NSString class]
or do I have to e.g.:
[[NSNumber numberWithInt:0] isKindOfClass:inClass]
Roddi
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Re: NSUndoManager messing up Core Data database
Hi Ron, I wasn't clear enough on one point. The main thread context's undo manager crashes (the posted backtrace), but changing the DB only happens in the background thread. Assuming no binding changes the main thread context, there shouldn't be anything to undo in the main thread context. I cannot be 100% sure the bindings behave read-only when they should, of course. btw.: I'd like to propose that there should be a way to switch a context to read-only. I'd file a radar if you want me to. Am 08.10.2008 um 18:23 schrieb Ron Lue-Sang: The background thread (called database access thread) is the one that changes the database exclusively, all database modifying is funnelled through it. The main thread is supposed to only read- access the database. How do I do that? Since I already use mogenerator (http://rentzsch.com/code/mogenerator) I changed the generator template to check for the correct thread on write access. That way I could pinpoint a lot of accidental write accesses, which led to context inconsistencies. There's one I could not get rid of. It is done by the NSUndoManager. Which is weird as there is no write access to the database from the main thread the NSUndoManager is so keen on undoing. What is going on? In my case I'd like to get rid of the NSUndoManager altogether as I don't need it. Is there a way to do that? Well, the short answer is: backgroundManagedObjectContext = [[NSManagedObjectContext alloc] init]; [backgroundManagedObjectContext setUndoManager:nil]; But that's assuming that the undoManager in frame 15 of your bt is [backgroundManagedObjectContext undoManager]. I think that's the only way you'd get into the situation you've described. -- RONZILLA Ruotger ___ 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 [EMAIL PROTECTED]
Re: NSUndoManager [EMAIL PROTECTED] up Core Data database
Hi Ben, yes, there are some sporadic problems left in save: but these are exception I can handle. The NSUndoManager crashes were totally beyond my control, so this is going to help a lot. Thanks Ruotger Am 08.10.2008 um 22:23 schrieb Ben Trumbull: Ruotger, This has less to do with the undo manager itself, and more to do with event coalescing. You can set the undo manager for the MOC to nil, but this problem will happen elsewhere later, like -save: or - executeFetchRequest: or when you call -processPendingChanges yourself. This code is following the delete rules in your model for a deleted object to cascade the necessary relationship maintenance throughout the graph. - Ben ___ 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 [EMAIL PROTECTED]
Multithreaded Core Data app design
Hi, Since Ron asked, let's move this to an own thread (no pun intended): Am 08.10.2008 um 18:23 schrieb Ron Lue-Sang: Hi, I have a core data database with two contexts attached to it. One read-only for the main thread and bindings, one read/write for a background thread that takes data from the network and feeds it into the database. I know this is an effed-up design you shouldn't copy, but it won't change. (For why this is a bad idea: http://lists.apple.com/archives/Cocoa-dev/2007/May/msg00066.html but please let's not discuss this here, thx) Where shall we discuss this then? I have comments =) Here. Go ahead! Ruotger ___ 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 [EMAIL PROTECTED]
NSUndoManager [EMAIL PROTECTED] up Core Data database
Hi, I have a core data database with two contexts attached to it. One read- only for the main thread and bindings, one read/write for a background thread that takes data from the network and feeds it into the database. I know this is an effed-up design you shouldn't copy, but it won't change. (For why this is a bad idea: http://lists.apple.com/archives/Cocoa-dev/2007/May/msg00066.html but please let's not discuss this here, thx) The background thread (called database access thread) is the one that changes the database exclusively, all database modifying is funnelled through it. The main thread is supposed to only read-access the database. How do I do that? Since I already use mogenerator (http://rentzsch.com/code/mogenerator ) I changed the generator template to check for the correct thread on write access. That way I could pinpoint a lot of accidental write accesses, which led to context inconsistencies. There's one I could not get rid of. It is done by the NSUndoManager. Which is weird as there is no write access to the database from the main thread the NSUndoManager is so keen on undoing. What is going on? #1 0x00045652 in -[_GBEbayItem setDetails:] at _GBEbayItem.m:812 #2 0x97009f14 in -[NSManagedObject(_NSInternalMethods) _propagateDelete] #3 0x970099b4 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _propagateDeletesUsingTable:] #4 0x970096df in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processDeletedObjects:] #5 0x96fc7398 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _propagatePendingDeletesAtEndOfEvent:] #6 0x96fc6f69 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] #7 0x96fdabea in -[NSManagedObjectContext processPendingChanges] #8 0x970033a5 in - [NSManagedObjectContext(_NSInternalNotificationHandling) _processEndOfEventNotification:] #9 0x953152dc in _nsnote_callback #10 0x94803aba in __CFXNotificationPost #11 0x94803d93 in _CFXNotificationPostNotification #12 0x95312440 in -[NSNotificationCenter postNotificationName:object:userInfo:] #13 0x9531bc88 in -[NSNotificationCenter postNotificationName:object:] #14 0x9537c10a in -[NSUndoManager(NSUndoManagerPrivate) _postCheckpointNotification] #15 0x9537bf73 in -[NSUndoManager endUndoGrouping] #16 0x948aaa8c in -[NSSet makeObjectsPerformSelector:withObject:] #17 0x9535a750 in +[NSUndoManager(NSUndoManagerPrivate) _endTopLevelGroupings] #18 0x93db1d27 in -[NSApplication run] #19 0x93d7ef14 in NSApplicationMain In my case I'd like to get rid of the NSUndoManager altogether as I don't need it. Is there a way to do that? Ruotger P.S.: I think all this started around 10.5.3 or 10.5.4 but I'm not sure ___ 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 [EMAIL PROTECTED]
mouseMoved events and unfocused views
Hi, is there a way to get mouseMoved events in a view without it being the focused view (and without getting the focus, of course)? Thanks Ruotger ___ 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 [EMAIL PROTECTED]
Re: Message Framework and Garbage Collection
Hi, just to let you know: I'm trying to use the Message Framework with Garbage Collection enabled and it crashes deep down in the framework. I filed a bug: 6128812 You can [...] use Pantomime, Pantomime is not GC-ready. I haven't tried to switch on CG and see what happens though. Ruotger ___ 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 [EMAIL PROTECTED]
Re: Message Framework and Garbage Collection
Hi B. I'm trying not to sound mean or angry here but I doubt that Apple will fix such an obvious bug in a deprecated framework, since it didn't do so already. So filing a radar bug seems to be a waste of time (again). Does anyone know, a way to send a mail programmatically in the background, i.e. without opening a "mailto:"; url? Ruotger On 04.08.2008, at 20:28, Bill Bumgarner wrote: On Aug 4, 2008, at 10:35 AM, Ruotger Skupin wrote: I'm trying to use the Message Framework with Garbage Collection enabled and it crashes deep down in the framework. With retain/ release it works fine. Am I correct in assuming that since it is deprecated for 10.5 it can't be used with GC? Is there anything that can be used instead? If it is in 10.5, it should work. Please file a radar. 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 [EMAIL PROTECTED]
Message Framework and Garbage Collection
Hi, I'm trying to use the Message Framework with Garbage Collection enabled and it crashes deep down in the framework. With retain/release it works fine. Am I correct in assuming that since it is deprecated for 10.5 it can't be used with GC? Is there anything that can be used instead? Ruotger ___ 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 [EMAIL PROTECTED]
Re: Trashing files and undo
Hi, if I get you right, you are suggesting I put an alias to the file into (say) ~/Library/Application Support/MyApp/UndoAliases/ remember the original path/filename then trash the file. To get it back I resolve the alias and move/rename it. What's the advantage over the FSRef solution Charles proposed? Ruotger Am 11.07.2008 um 17:44 schrieb Gregory Weston: Ruotger Skupin wrote: my app trashes files with -[NSWorkspace performFileOperation:source:destination:files:tag:] and NSWorkspaceRecycleOperation. This works flawlessly but users want undo. NSWorkspace does not seem to allow undoing said file operation (or any file operation for that matter). Correct me if I'm wrong. So I might have to figure out where the trash directory for a given volume/user/file etc is and move it myself. Is there an easy way to find that out? Drop-dead simple. FSFindFolder is your friend. Give it a volume reference number and tell it you're looking for the user's trash and it'll hand it back to you (creating it if necessary and you asked for that behavior). I think possibly a bigger issue here is going to be that moving files to the trash can cause them to be renamed. At least doing so in Finder can; I'm not sure if the NSWorkspace routine does the same. You'll need a reliable way to track the file and map that back to the original location and name. You'll want to look at aliases for that. ___ 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/lists%40chipmunk-app.com This email sent to [EMAIL PROTECTED] ___ 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 [EMAIL PROTECTED]
Re: Trashing files and undo
Hi Charles, let me make sure I understand that. I get the FSRef and the original path of the file and keep hold of the information before trashing it with performFileOperation. When I want it back, I resolve the FSRef and move it back to original location. Ruotger Am 11.07.2008 um 17:54 schrieb Charles Srstka: On Jul 11, 2008, at 10:44 AM, Gregory Weston wrote: Drop-dead simple. FSFindFolder is your friend. Give it a volume reference number and tell it you're looking for the user's trash and it'll hand it back to you (creating it if necessary and you asked for that behavior). I think possibly a bigger issue here is going to be that moving files to the trash can cause them to be renamed. At least doing so in Finder can; I'm not sure if the NSWorkspace routine does the same. You'll need a reliable way to track the file and map that back to the original location and name. You'll want to look at aliases for that. You can just use an FSRef, which will track the file even after it's been moved. You have to use a little Carbon for this, but it's not bad. Just use either FSPathMakeRef() or CFURLGetFSRef() to make the FSRef before you move the file to the trash, and then use FSRefMakePath() or CFURLCreateFromFSRef() to get the new path to the file after you've trashed it. An added benefit to this is that even if Apple ends up moving ~/.Trash to some other location in a future version of OS X, this will still work (as long as FSRefs still work on whatever new file system we get moved to). Charles ___ 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/lists%40chipmunk-app.com This email sent to [EMAIL PROTECTED] ___ 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 [EMAIL PROTECTED]
Trashing files and undo
Hi, my app trashes files with -[NSWorkspace performFileOperation:source:destination:files:tag:] and NSWorkspaceRecycleOperation. This works flawlessly but users want undo. NSWorkspace does not seem to allow undoing said file operation (or any file operation for that matter). Correct me if I'm wrong. So I might have to figure out where the trash directory for a given volume/user/file etc is and move it myself. Is there an easy way to find that out? Thanks for any pointers Ruotger ___ 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 [EMAIL PROTECTED]
Re: Debugging strategy - exceptions
I would rather not try to teach my users gdb... Ruotger Am 09.07.2008 um 12:31 schrieb Joan Lluch (casa): El 09/07/2008, a las 12:13, Ruotger Skupin escribió: So an exception got thrown for a pretty obvious reason, but where? Could be anywhere, even in WebKit (which we use). Is there any chance to get near the culprit without a stack trace (which I don't have)? This question is more suitable for the Xcode-user list, but anyway, you should get a proper stack trace by breaking at "objc_exception_throw". Did you try it? Joan Lluch ___ 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 [EMAIL PROTECTED]
Debugging strategy - exceptions
Hi, this is more of an open discussion topic than a concrete question but hopefully someone has a good idea about this: I got a bug report of a non-crash bug I cannot reproduce and where I do not even know where to start looking. The only hint is a line in the console.log: *** -[NSCFDictionary initWithObjects:forKeys:count:]: attempt to insert nil value at objects[0] (key: NSFont) So an exception got thrown for a pretty obvious reason, but where? Could be anywhere, even in WebKit (which we use). Is there any chance to get near the culprit without a stack trace (which I don't have)? Even worse: There does not to be a way to switch off exceptions without switching off @synchronized() at the same time. That's not an option for the code in question. Ruotger ___ 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 [EMAIL PROTECTED]
NSPredicateEditor and decimal numbers with fractions
Hi,
I've set up an NSPredicateEditor with a template that forms a
predicate like: [Gross Value] [is] [32.99]
the format of the text field is set as Number in Interface Builder. If
I input 32.99 into the field I get a predicate like this:
grossAmount.amount == 32
Obviously the number is rounded off at the decimal point. Since this
is a currency amount, I need the decimal fraction ("the cents").
Any Advice?
Ruotger
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NSPredicateEditor and decimal numbers with fractions
Hi,
I've set up a NSPredicateEditor with a template that forms for example
a predicate like: [Gross Value] [is] [ ]
the format of the text field is set as Number in Interface Builder. If
I input 32.99 into the field I get a predicate like this:
grossAmount.amount == 32
Obviously the number is rounded off at the decimal point. Since this
is a currency amount, I need the decimal fraction ("the cents").
Any Advice?
Ruotger
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probably OT: using encrypted disk images with NSTask and hdiutil
Hi, To protect sensitive user data I attach an encrypted disk image and store the application data there. I'm using hdiutil with the -passphrase option to create and attach encrypted disk images. This is deprecated and obviously not the correct way but quite frankly the man file for hdiutil is not very helpful: -certificate certificate_file specify a secondary access certificate for the image being created. -pubkey PK1,PK2,...,PKn specify a list of public key hashes in ASCII hex for the image being created. The hash(s) will be used to locate a public key used to protect an encrypted image. Is there any example code how to do this in Cocoa? Ruotger ___ 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 [EMAIL PROTECTED]
Core Data: How to encrypt a persistent store
Hi, I have an application which uses Core Data and handles sensitive information. Is there an easy way to encrypt the on-disk persistent store provided I'm reasonably fluent in libCrypto and do not want to use an encrypted disk image? Ruotger ___ 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 [EMAIL PROTECTED]
Re: Chained Migration of Leopard CoreData stores
Am 17.04.2008 um 02:30 schrieb Ben Trumbull:
Hi,
let's say I have four versions of my data model:
DataModel1.xcdatamodel
DataModel2.xcdatamodel
DataModel3.xcdatamodel
DataModel4.xcdatamodel (this is the current one)
and three model mapping files which always map from version n to
version n+1:
Mapping1to2.xcmappingmodel
Mapping2to3.xcmappingmodel
Mapping3to4.xcmappingmodel
Now I load a version 1 data file:
NSDictionary *options = [NSDictionary dictionaryWithObject:
[NSNumber numberWithBool:YES]
forKey:NSMigratePersistentStoresAutomaticallyOption];
NSError *error = nil;
if (![persistentStoreCoordinator
addPersistentStoreWithType:NSSQLiteStoreType configuration:nil
URL:url options:options error:&error])
{
...
}
should the data file automatically be migrated to the current
version 4 or do I need a single direct mapping like this:
Mapping1to4.xcmappingmodel
If you want Core Data to do everything, you'll need 1 mapping model,
since we don't assume that iterative upgrades will necessarily work.
fair enough. But when releasing a version n of my app I'd rather have
have the cost O(1) than O(n) building mappings.
If you're confident that composing your N+1 mapping models together
makes sense for your app, you can run N+1 migrations in a row to
avoid needing an umbrella mapping model.
Ok, let's say I'm confident. Two questions:
- How do I find out what data model my store uses? (So that I know
where to start)
- How do I find out which two data models correspond to a given
mapping? (So that I know which data model and mapping to use next)
Ruotger
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Chained Migration of Leopard CoreData stores
Hi,
let's say I have four versions of my data model:
DataModel1.xcdatamodel
DataModel2.xcdatamodel
DataModel3.xcdatamodel
DataModel4.xcdatamodel (this is the current one)
and three model mapping files which always map from version n to
version n+1:
Mapping1to2.xcmappingmodel
Mapping2to3.xcmappingmodel
Mapping3to4.xcmappingmodel
Now I load a version 1 data file:
NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber
numberWithBool:YES]
forKey:NSMigratePersistentStoresAutomaticallyOption];
NSError *error = nil;
if (![persistentStoreCoordinator
addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url
options:options error:&error])
{
...
}
should the data file automatically be migrated to the current version
4 or do I need a single direct mapping like this:
Mapping1to4.xcmappingmodel
Ruotger
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NSLocale: " " vs. " "
Hi, Is there a way to determine if a user (or an address depending on the country) prefers the zip code first or the city name first, e.g.: Apple 1 Infinite Loop Cupertino, CA 95014 vs Apple Computer GmbH Dornacher Straße 3 D 85622 Feldkirchen Germany Probably one might want to figure out the whole address format somehow. Ruotger ___ 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 [EMAIL PROTECTED]
