Re: when is derived column resolved
Re: when is derived column resolved
- Subject: Re: when is derived column resolved
- From: Theodore Petrosky <email@hidden>
- Date: Tue, 12 Jan 2016 19:09:42 -0500
> On Jan 12, 2016, at 4:41 PM, Paul Hoadley <email@hidden> wrote:
>
> Hi Ted,
>
> On 13 Jan 2016, at 6:49 am, Theodore Petrosky <email@hidden> wrote:
>
>> I have an Entity with a derived column. Entity Person, real attributes firstName, lastName, derived column fullName firstName || ' ' || lastName.
>>
>> the derived column only shows up when I first run the app. when I add new people, the derived column is blank. even login out and back in does nothing. But when I stop the app and relaunch it, the derived column resolves and I see what I expect.
>
> Derived attributes are computed by the database, and so only updated when the EO is fetched into memory. To update the derived attribute, you would need to cause the EO to be re-fetched from the database.
>
>> 1. should I go back to creating a method on Entity Person fullName that returns a string concatenating first and last names?
>
> Probably, yes.
OK, that’s a plan, when do you feel it’s appropriate to use a derived column?
>
>
> --
> Paul Hoadley
> http://logicsquad.net/
>
>
>
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