An EO lives in a specific EC and can’t be moved between then as a single Java object instances. The reason why localInstnace won’t work for new objects is that it does not move or copy the EO into the new EC. It creates and brand new Java EO object and loads its values from the snapshot cache (or possibly from the database but let’s not over complicate this explanation). An unsaved EO has no values in the snapshot cache (they get added when saved), so it is flat out not possible to localnstance a new object without some major changes to EOF.
What might work for you is a child EC. You can then revert what changes you don’t want and save into the parent EC for final saving. ERXCopyable might also be a solution. Chuck From: <[email protected]<mailto:[email protected]>> on behalf of Aaron Rosenzweig <[email protected]<mailto:[email protected]>> Date: Thursday, July 16, 2015 at 10:56 AM To: Roger Perryman <[email protected]<mailto:[email protected]>> Cc: WebObjects Dev List <[email protected]<mailto:[email protected]>> Subject: Re: localInstanceOfObject Hi Roger, I skimmed your post. You cannot local instance an unsaved object. You just cannot do it. Don’t try anything clever… the EO is tied to a unit of work (editing context) and without ever being saved it simply is not possible to local instance it. You may have to use the “memento” pattern for your particular case. Make a simple java object, nothing about DB persistence… and then make it an EO only after it has passed muster. Aaron Rosenzweig / Chat 'n Bike<http://www.chatnbike.com> e: [email protected]<mailto:[email protected]> t: (301) 956-2319 [Chat 'n Bike] [Chat 'n Bike] On Jul 16, 2015, at 1:04 PM, Roger Perryman <[email protected]<mailto:[email protected]>> wrote: Hi All! I am having an issue with local instancing an EO and I would like some help understanding the problem. I found an old thread started by Kieran Kelleher where he was having similar issues. Mike Schrag had mentioned that EOF couldn't tell if a new object localInstanced from another EC had later been saved in the other EC which could result in collisions so it erred on the side of caution. So I am probably using the method inappropriately. Hopefully someone will point out the problem and offer the correct way. I've noticed that when I localInstance a new EO (not yet saved to the database) both the WebObjects and WOnder versions return null for the EO. It seems odd for the method to return null if it is a new method. I wrote a customized version that detects if it is a new EO and just returns the original EO. I've been using it for quite some time now and it at least _seemed_ to work better. My use cases must have avoided conflicts. However, I've recently noticed problems. They may have been there before. I did recently update my computer (OSX 10.10.3) and dev environment to the latest WOnder (6.1.4-SNAPSHOT), Java 8 (1.8.0_45), Eclipse (4.4.2) with matching WOLips. I'm creating a new EC because many of the objects in the original EC are disposable and are not intended to be written to the DB, even if they happen to change. The problem is because of passing the original EO to the new EC instead of NULL that would normally be returned but the relationships cannot be NULL. I wrote a clone method for some of the objects for testing but it got very complex very fast because of deeper objects in the relationship. As you can see from my debugging output, all required fields (*'s) are set and relationships are set. This group is the objects in the old (original) EC and the original Invoice that has not been saved yet but it has had an oid assigned. It also has a to-many relationship to new ProductItem objects. OLD EC EditingContext:ERXEC@2d334040 Registered [375]:List omitted Inserted [ 5]:[Invoice PK: 250], [ProductItem PK: 74], [ProductItemPayment PK: 61], [ShoppingCart PK: 44], [ShoppingCartProduct PK: 44] Updated [ 3]:<Account pk:167>, <Practice pk:1>, <User pk:2> Deleted [ 0]:EMPTY OLD Invoice: Invoice(5bdf1c53) : globalID = <Invoice PK: 250> { pending } editingContext = ERXEC@2d334040 Added to EC Attributes approvedDeposit = NULL dateRecordCreated = Wednesday July 15, 2015 @ 03:19 PM * dateRecordModified = Wednesday July 15, 2015 @ 03:19 PM * invoiceDate = Wednesday July 15, 2015 @ 03:19 PM * invoiceDiscount = NULL invoiceNumber = IJD20150715151938381 * isActive = true * taxRate = 0.07 * totalFees = 0.0 * totalNonTaxable = 0.0 * totalTaxable = 0.0 * version = 1 * To-One Relationships toAccount = <Account PK: 167> * toCheckListPostOp = NULL toCheckListPreOp = NULL toCheckListSurgery = NULL toCoordinator = <User PK: 2> ( Jane Doe ) * toInvoiceStatus = <InvoiceStatus PK: 1> ( Open ) * toInvoiceType = <InvoiceType PK: 2> ( Invoice ) * toPractice = <Practice PK: 1> ( DEFAULT_PRACTICE ) * toSurgeryRequest = NULL To-Many Relationships toProductItems[ 1 ] 1) eoObj = <ProductItem PK: 74> { pending } toRequestDetails No Records toServiceItems No Records This group is the objects in the new EC and the cloned Invoice that has not been saved yet but it has had an oid assigned. It also has a to-many relationship to new ProductItem objects. Note the oid has increased and unique attributes have been adjusted. When I try to save, it fails because the objects associated with ProductItems have a relationship in a different EC (and retain their original oids). NEW Invoice: Invoice(6371d408) : globalID = <Invoice PK: 251> { pending } editingContext = ERXEC@1c741963 Added to EC, Updated in EC Attributes approvedDeposit = NULL dateRecordCreated = Wednesday July 15, 2015 @ 03:30 PM * dateRecordModified = Wednesday July 15, 2015 @ 03:30 PM * invoiceDate = Wednesday July 15, 2015 @ 03:19 PM * invoiceDiscount = NULL invoiceNumber = IJD20150715151938952 * isActive = true * taxRate = 0.07 * totalFees = 0.0 * totalNonTaxable = 0.0 * totalTaxable = 0.0 * version = 1 * To-One Relationships toAccount = <Account PK: 167> * toCheckListPostOp = NULL toCheckListPreOp = NULL toCheckListSurgery = NULL toCoordinator = <User PK: 2> ( Jane Doe ) * toInvoiceStatus = <InvoiceStatus PK: 1> ( Open ) * toInvoiceType = <InvoiceType PK: 2> ( Invoice ) * toPractice = <Practice PK: 1> ( DEFAULT_PRACTICE ) * toSurgeryRequest = NULL To-Many Relationships toProductItems[ 1 ] 1) eoObj = <ProductItem PK: 74> { pending } toRequestDetails No Records toServiceItems No Records NEW ProductItems: ( ProductItem(1695d9bc) : globalID = <ProductItem PK: 74> { pending } editingContext = ERXEC@2d334040 Added to EC, Updated in EC Attributes dateRecordCreated = Wednesday July 15, 2015 @ 03:15 PM * dateRecordModified = Wednesday July 15, 2015 @ 03:15 PM * discountAmount = 0.0 * isActive = true * unitAmount = 100.0 * unitQuantity = 1 * version = 1 * To-One Relationships toAuthorizedBy = NULL toInvoice = <Invoice PK: 250> { pending } toProduct = <Product PK: 3> ( Abdominoplasty Garment ) * To-Many Relationships toGiftCards No Records toPayments No Records toProductItemPayments[ 1 ] 1) eoObj = <ProductItemPayment PK: 61> { pending } toShoppingCartProducts[ 1 ] 1) eoObj = <ShoppingCartProduct PK: 44> { pending } ) NEW EC EditingContext:ERXEC@1c741963 Registered [179]:List omitted Inserted [ 1]:[Invoice PK: 251] Updated [ 3]:<Account pk:167>, <Practice pk:1>, <User pk:2> Deleted [ 0]:EMPTY Is there a correct way to "localInstance" an unsaved EO? Or do I need to restructure the code and perhaps use nested ECs? Thanks, Roger _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list ([email protected]<mailto:[email protected]>) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/webobjects-dev/aaron%40chatnbike.com This email sent to [email protected]<mailto:[email protected]>
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