[Evergreen-dev] Fieldmapper usage for vendor making api calls

[Galen Charlton]

Hi,

Having the app consult the IDL is indeed the way to go. This ideally should
happen on startup, although it would be reasonable to cache the results,
potentially for fairly lengthy durations. The 24 hours you suggest should
generally be fine, although it could still lead to some friction for
patrons the day after an Evergreen upgrade. Triggers for updating the
cached IDL values would include:

- a change in Evergreen version number as reported
by opensrf.open-ils.system.ils_version
- a change in file modification date reported by an HTTP HEAD request on
/reports/fm_IDL.xml

Parsing /reports/fm_IDL.xml will work, but alternatives to parsing the
whole IDL (most of which is presumably irrelevant to the app) is parsing
the output of /IDL2js. This can be restricted to only the class of
interested, e.g., /IDL2js?acp,au

Regards,

Galen

On Wed, Oct 11, 2023 at 8:55 AM Josh Stompro via Evergreen-dev <
evergreen-dev at list.evergreen-ils.org> wrote:

> Hello, I was working with Solus on some breakage of their app after our
> upgrade to 3.11.  The issue was related to the fields ordering changing in
> the results to  service=open-ils.auth method=open-ils.auth.session.
> retrieve.
>
> When they initially set it up, they just went by the index number of each
> result, but that changed due to actor.usr changes over the years.
>
> I suggested that they could take a look at  /reports/fm_IDL.xml for the
> new ordering, and they quickly setup a system to grab that file every 24
> hours and use it to access the fields for api results.  I just wanted to
> double check to see if that is the recommended way to handle things if they
> have customers with different versions of evergreen?  Is there a simpler
> approach that would be better?
>
> Thanks
> Josh
> [image: Company logo]
> *Josh Stompro*
> IT Director
> stomproj at gsuite.larl.org | 218-233-3757 ext. 139 | 218-790-2110
> *Lake Agassiz Regional Library *
> 118 5th ST S
> Moorhead MN 56560
> www.larl.org
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-- 
Galen Charlton
Implementation and IT Manager
Equinox Open Library Initiative
gmc at equinoxOLI.org
https://www.equinoxOLI.org
phone: 877-OPEN-ILS (673-6457)
direct: 770-709-5581
<http://evergreen-ils.org>
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