David: I do lock on a last updated attribute (modifyDate) that is a timestamp. I have always done this in all my models - probably since when I was first trained by Apple, that was how our early models were built.
Then modifyDate is always updated by a editing context delegate. Is this something I should take out? I'm concerned about what could happen after all this time. I do have multiple apps that use the same "Person" entity to make relationships and such so maybe the locking collision is there. Tim UCLA GSE&IS On Jun 3, 2013, at 3:01 PM, David LeBer <[email protected]> wrote: > Tim, > > Have you checked all of the usual suspects for optimistic locking problems in > your model? > > Locking on blobs and timestamps are the two that come to mind. > > We've run D2W apps in production for ages without these kinds of problems, so > it is not a widespread issue that needs an across the board fix. > > D > > -- > David LeBer > Codeferous Software > > On 2013-06-03, at 5:50 PM, Tim Worman <[email protected]> wrote: > >> Ramsey: >> >> Thanks much. I'll check out freshness explorer. >> >> What do you do for D2W typically? Clobber all fetches with a rule and have >> it always refreshRefetchedObjects for everything or do you typically only >> put a rule in for certain views and relationships? >> >> Tim >> >> On Jun 3, 2013, at 1:19 PM, Ramsey Gurley <[email protected]> wrote: >> >>> >>> On Jun 3, 2013, at 12:06 PM, Tim Worman wrote: >>> >>>> an optimistic locking problem I believe. If I kick a new instance >>>> everything is fine. >>> >>> That sounds like you need to refreshRefetchedObjects on your fetch spec. If >>> you've previously fetched a row, and then another instance changes that >>> same row, then you fetch the row again in the first instance, the snapshot >>> is not refreshed unless you tell it do so explicitly. >>> >>> With the default false value for refreshRefetchedObjects, you can actually >>> fetch with a qualifier q, and then filter your fetched array with q in >>> memory and get a smaller array of results. >>> >>> I suggest playing around with the freshness explorer app for a few minutes. >>> I found the results to be eye opening. >>> >>> https://github.com/nullterminated/ponder/blob/master/ERR2d2w/Support/FreshnessExplorer.zip >>> >>> Ramsey >>> >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Webobjects-dev mailing list ([email protected]) >> Help/Unsubscribe/Update your Subscription: >> https://lists.apple.com/mailman/options/webobjects-dev/dleber_wodev%40codeferous.com >> >> This email sent to [email protected] > _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to [email protected]
