Hi, On 2015-02-20, 3:52 AM, "OC" wrote:
Ramsey, On 19. 2. 2015, at 19:15, Ramsey Gurley <rgur...@smarthealth.com<mailto:rgur...@smarthealth.com>> wrote: You do a lot of weird stuff :) Actually _this_ should not be weird, this should be quite a normal code; the only requirement is that check-and-save, i.e., conceptually, === if (eo.someRelationship().someAttribute()<newAttributeValue) { def new=EOUtilities.createAndInsertInstance(eo.editingContext(),'SomeRelationshipTarget') new.someAttribute=newAttributeValue eo.editingContext().saveChanges() } === so that I can be absolutely sure that no two users from two sessions may store the same attribute value. The current application is running single-instance, which makes the problem somewhat easier, but surprisingly, not easy by far, given WOAllowsConcurrentRequestHandling=YES. Is there a well-known pattern for this? (Hmmm... now it occurred to me, perhaps I might set up an UNIQUE db restraint? That would probably simplify the code mightily, _and_ work for multi-instance case just as well...) I believe that is the only way to absolutely ensure this. I don’t think you can make a rock-solid guarantee from the app code level. Other parts of my code though -- eg. the primary-key-based „static“ objects which in the old version I, triple alas, can't get rid of for time reasons -- definitely are, and then some :) Have you installed jadclipse yet? https://wiki.wocommunity.org/display/documentation/Useful+Eclipse+Plugins You can probably answer a lot of your questions just looking at the source. I can hardly install the thing, for I am not using Eclipse anymore -- can't speak for other platforms, but on Mac, I have never seen a worse IDE. Have a look at http://jd.benow.ca Has IntelliJ support and a stand alone GUI. Nevertheless thanks again, as soon as I have some extra time I'll check the sources (along with those of FreshnessExplorer). If I had this problem, I’d probably first try providing my own EC subclass through the ERXEC factory with deleteObject(eo) overridden. If that didn’t catch it, then I’d dig around in the WO source to find where in the save changes process owns destination comes into play. The WO sources are available (though perhaps unofficially)? I have thought Apple keeps them well locked out. How can one get them?' They are not available. I believe that Ramsey was referring to decompilation. Which violates the Apple license (just to be clear). Chuck Thanks again a very big lot, OC On Feb 19, 2015, at 7:48 AM, OC <o...@ocs.cz<mailto:o...@ocs.cz>> wrote: Hello there, occassionally, an object gets deleted which should not be. Now, just before "ec.saveChanges()" I am logging out === lognow "saving INS:$ec.insertedObjects.count UPD:$ec.updatedObjects.count DEL:$ec.deletedObjects.count" === and in my "databaseContextWillPerformAdaptorOperations" delegate method I am logging out all the operations, and the results I sort of can't decode: === 14:38:16.299|WorkerThread14 --- saving INS:2 UPD:4 DEL:0 ... about to perform 4 DB operations - 1: INSERT on 'DBPriceOffer' 8{validOffer:false, sheetConfirmed:<com.webobjects.foundation.NSKeyValueCoding$Null>, uid:1022548, auction_id:1000233, amount:<com.webobjects.foundation.NSKeyValueCoding$Null>, price:1142, creationDate:2015-02-19 13:38:15 Etc/GMT, creator_id:1000058} - 2: INSERT on 'DBAudit' 8{creator_id:1000058, uid:1031224, creationDate:2015-02-19 13:38:15 Etc/GMT, kind:8, auction_id:1000233, title:cenov? návrh 1142 CZK/MWh, aktuální auk?ní cena 11…, market_id:1000001, ipAddress:212.27.219.66} - 3: UPDATE on 'DBAuction' ((uid = 1000233) and (commodityTimechunksString = 'LVO-1022542: 1140/null (true/0) 2015-02-19 13:38:10 Etc/GMT BY EONenergie (1000048) USR EONenergie (1000048) ===> prc 1139 CU RWEEnergie USR RWEEnergie BR Hurtova (RB false)') and (commodityPriceSelectionType = 1022547)) 1{commodityTimechunksString:LVO-1022547: 1139/null (true/0) 2015-02-19 13:38:1…} - 4: DELETE on 'DBUserAuction' ((user_id = 1000058) and (auction_id = 1000233)) === Those inserts make complete sense, no problem with them at all. They should happen, and their contents is OK. There were 4 updates in editing context, but there's only one update operation. Now, do please correct me if I am wrong, but I understand the editing context saves all changes (regardless the value might be same as before) and consider them “updates”; when saving though, it compares them against the snapshot and makes an operation only if the value differs. Thus, UPD:4 make sense too, and the one update which changes only a string attribute 'commodityTimechunksString' of auction 1000233 makes complete sense. It should happen, and the contents is OK. The 4th operation is the problem. It should not happen. From the fact just before save ec.deletedObjects.count==0 (DEL:0) I infer that EOF decided to delete the object based on ownership or cascade deletion rules. Given nothing other got deleted, it _must_ be ownership -- the object having been removed from some owned relationship. There indeed are two of them. Now, the trick is that I am pretty sure I am _not_ removing any of these object from either of the relationships: at the very least, I can't recall I would (the DBUserAuction objects are not intended to be ever deleted, unless the user or auction to which they belong are deleted too), and nor I can find any usage of removeObjectFromBothSides... nor other APIs with the relationships in question. Is there some trick to catch the code which actually causes the deletion? I've tried to observe EOEditingContext.ObjectsChangedInEditingContextNotification, but it seems it does not get posted even if I add a removeObjectFromBothSides... manually to test. Will be grateful for any advice, OC _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com<mailto:Webobjects-dev@lists.apple.com>) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/rgurley%40smarthealth.com This email sent to rgur...@smarthealth.com<mailto:rgur...@smarthealth.com> _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com<mailto:Webobjects-dev@lists.apple.com>) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/chill%40gevityinc.com This email sent to ch...@gevityinc.com<mailto:ch...@gevityinc.com>
_______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
