Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!?
Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!?
- Subject: Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!?
- From: OC <email@hidden>
- Date: Sat, 28 Feb 2015 20:15:07 +0100
Chuck,
On 28. 2. 2015, at 19:54, Chuck Hill <email@hidden> wrote:
>> But. It being the week end and me having at least some time free, I've played with the thing further. I've found that the GIDs are _not_ the culprit actually; the problem happens with localInstancesIn just as well -- _presumed I call changesFromCommittedSnapshot_[*]. Triple Wow.
>
> Ah, Schrödinger’s EOF. :-P Observing some things can materially change the state of EOF. Calling this method calls ec.committedSnapshotForObject() which causes the EC to record the committed snapshot for the object at that point in time. Normally this is done only at the point the EO first changes.
Aha, I see; it even makes some sense :)
What does not make any sense (to me at least) is that
(a) when the committed snapshot is NOT recorded, the owning relationship does what is expected, deleting the object,
(b) when it IS recorded, it does not delete the object, just NULLs its FK to the auction, as if it was not owning at all?
(Well, it's rather academic question now -- thanks to Bogdan, Stefan and Theodore I've got to the gold mine of information, incl. your “Optimization: EOF and beyond”, one of results of which is that I'll pretty soon re-write the deletion code to ERXEOAccessUtilities.deleteRows... anyway :P)
Thanks and all the best,
OC
> The following code:
>
> ===
> def ec=ERXEC.newEditingContext(),ec2=ERXEC.newEditingContext()
> ec.lock(); ec2.lock() // pbbly superfluous, but you said this prevents lots of hidden surprises :)
> def eo=EOUtilities.objectWithPrimaryKeyValue(ec,'DBAuction',1000004)
> def records=eo.importedRecords()
> def r1=records[0],r2=records[1]
> r1.removeObjectFromBothSidesOfRelationshipWithKey(eo,'auction')
> ec.saveChanges()
> def eo2=eo.localInstanceIn(ec2),r22=r2.localInstanceIn(ec2)
> //eo2.changesFromCommittedSnapshot() // WHAT THE?!?
> r22.removeObjectFromBothSidesOfRelationshipWithKey(eo2,'auction')
> ec2.saveChanges()
> ===
>
> works properly, i.e., it DELETEs twice. As soon as I remove the comment-out at the WHAT THE line, i.e., as soon as "eo2.changesFromCommittedSnapshot()" gets called, I get DELETE/UPDATE (to null). Comment the line out again, two DELETEs are back.
>
> This gets curiouser and curiouser.
>
> Do you have any idea what the b. H. happens there? Or at least, what would you recommend I should try now, so that the culprit is found?
>
> Thanks and all the best,
> OC
>
> [*] What mislead me were my overridden toString's, in which I use changesFromCommittedSnapshot to print out the edited state.
>
>
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| References: | |
| | >in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: OC <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: Chuck Hill <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: OC <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: Chuck Hill <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: OC <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: Chuck Hill <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: OC <email@hidden>) |
| | >Re: in another EC, when objects transferred through GIDs, owning relationship does not delete objects?!? (From: Chuck Hill <email@hidden>) |