Re: Derived read-only attribute to expose PK [Was: Re: postgresql serial columns and wonder]
Re: Derived read-only attribute to expose PK [Was: Re: postgresql serial columns and wonder]
- Subject: Re: Derived read-only attribute to expose PK [Was: Re: postgresql serial columns and wonder]
- From: Chuck Hill <email@hidden>
- Date: Wed, 03 Oct 2012 09:23:14 -0700
Or just make it a class property. Some people find that offensive, but it won't cause problems for EOF. Exposed FK does cause problems.
Chuck
On 2012-10-03, at 1:34 AM, Paul Hoadley wrote:
> Hi Johann,
>
> On 03/10/2012, at 5:26 PM, Johann Werner wrote:
>
>> derived attributes are "computed" by the database and thus those values are only updated when an eo is fetched into memory. In your case you are creating a new eo that has NULL for these attributes and as long as WO uses that eo or its snapshot cache those values will be still NULL. You have to refetch the eo to update the derived attributes.
>
> Thanks for the explanation. Looks like a derived attribute is not the solution for this use case, then.
>
> I wrote:
>
>>> (As an aside, last time I looked at this was a few months ago, and I swear it was behaving properly then—i.e., that the derived attribute was immediately visible.)
>
> Clearly I imagined that.
>
>
> --
> Paul Hoadley
> http://logicsquad.net/
>
>
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Chuck Hill Senior Consultant / VP Development
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