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Re: [yang-doctors] conditional default?

Martin Björklund <mbj+ietf@4668.se> Sun, 23 May 2021 18:17 UTC

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Date: Sun, 23 May 2021 20:17:07 +0200 (CEST)
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To: chopps@chopps.org
Cc: yang-doctors@ietf.org
From: Martin =?iso-8859-1?Q?Bj=F6rklund?= <mbj+ietf@4668.se>
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Subject: Re: [yang-doctors] conditional default?
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Hi,

Christian Hopps <chopps@chopps.org> wrote:
> 
> I received this good question during the IESG review of geo location
> module:
> 
> > * Is WGS-84 still the default for geodetic-datum when astronomical-body
> > * != "earth"?
> > ...
> > I don't know enough YANG to know if the "when" statement is usable in
> > this case to constrain the applicability of this default or not.
> 
> Is there a way to specify a conditional default in YANG?

No.  But you can explain in the description statement what happens if
the leaf doesn't have a value configured.

> A separate but related issue I ran into the other day is that I have a
> Boolean in a grouping that can default to true or false (in the actual
> software) depending on where it is included... Also curious if that's
> solvable.

Yes, by using refine:

  uses the-grouping {
    refine the-leaf {
      default "true";
    }
  }


/martin




> 
> Thanks,
> Chris.
> 
> _______________________________________________
> yang-doctors mailing list
> yang-doctors@ietf.org
> https://www.ietf.org/mailman/listinfo/yang-doctors

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