[yt-users] Derived field conflicts

[Nathan Goldbaum]

Hmm, if it's in a plugins file I think that's not supposed to happen for
the reason you provide in your original email.

Any chance you can make a minimal example using one of the datasets on
yt-project.org/data that triggers this behavior? If so please file an issue
so I can reproduce and take a look.

Nathan

On Mon, Mar 13, 2017 at 4:31 PM David Collins <dcollins4096 at gmail.com>
wrote:

> Hi, Nathan--
>
> They're in a plugins file.  I like having my derived fields in one spot to
> reduce confusion and improve code re-use.  The biggest problem I foresee
> with using ds.add_field  is the units and validators and logs have gotten
> kind of complicated, and I have a morass of scripts that instantiate
> datasets in various places, so putting each add_field with each ds will be
> cumbersome without making some jig to hold the parts.  Maybe that will be
> straight forward.
>
> Thanks!
> d.
>
> On Mon, Mar 13, 2017 at 5:10 PM, Nathan Goldbaum <nathan12343 at gmail.com>
> wrote:
>
> Is this yt.add_field call happening your script or in a plugins file?
>
> If it's in a script one simple way to do it would be to replace the call
> to yt.add_field with a call to ds.add_field that's inside an if statement
> that checks to see if a needed field is in ds.field_list first.
>
> On Mon, Mar 13, 2017 at 4:05 PM, David Collins <dcollins4096 at gmail.com>
> wrote:
>
> Hi, Everybody!
>
> Every now and then I'll add a new field using yt.add_field() that includes
> the magnetic field.  If I then load another dataset that doesn't have the
> magnetic field, it chokes when it parses the hierarchy because it tries to
> validate my new field against the dataset that doesn't have B.  Is there a
> simple way I can fix my field definition to prevent this?
>
> I'd like to avoid adding every field manually to each dataset, since I
> have a lot of fields, and a lot of dataset, and some have B and some dont,
> etc.  but I see that's probably the most obvious fix.
>
> Thanks!
> d.
>
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