[yt-dev] Issue #824: Field detection issue when recreating data objects (yt_analysis/yt)

[Nathan Goldbaum]

Inspecting the stack trace with pdb reveals that fname is 'particle_mass'.


On Tue, Apr 1, 2014 at 4:56 PM, Matthew Turk <matthewturk at gmail.com> wrote:

> Hi Nathan,
>
> Weird.  I think this is probably related to at some point guessing the
> field type; you'll note that it comes from _determine_fields, which
> will call _get_field_info with "unknown".  If it can't figure out what
> it is (it defaults to the last type found) it throws the error.  Can
> you check what the fname is?
>
> -Matt
>
> On Tue, Apr 1, 2014 at 7:55 PM, Nathan Goldbaum
> <issues-reply at bitbucket.org> wrote:
> > New issue 824: Field detection issue when recreating data objects
> >
> https://bitbucket.org/yt_analysis/yt/issue/824/field-detection-issue-when-recreating-data
> >
> > Nathan Goldbaum:
> >
> > I ran into this when using a notebook.  I found that when I re-ran a
> cell that creates a data object and then calculates a derived quantity, I
> get a field detection error the *second* time I run the cell.
> >
> > The following script exposes the buggy behavior:
> http://paste.yt-project.org/show/4462/
> >
> > When run using the current experimental bookmark I get the following
> output and traceback:
> >
> >
> > ```
> > goldbaum at ROUS in ~
> > ○ python test.py
> > [8.15217983473e+49 g, 0.833333333333 code_mass]
> > Traceback (most recent call last):
> >   File "test.py", line 21, in <module>
> >     print ad.quantities.total_mass()
> >   File
> "/Users/goldbaum/Documents/yt-hg/yt/data_objects/derived_quantities.py",
> line 194, in __call__
> >     rv = super(TotalMass, self).__call__(fields)
> >   File
> "/Users/goldbaum/Documents/yt-hg/yt/data_objects/derived_quantities.py",
> line 163, in __call__
> >     rv = super(TotalQuantity, self).__call__(fields)
> >   File
> "/Users/goldbaum/Documents/yt-hg/yt/data_objects/derived_quantities.py",
> line 59, in __call__
> >     sto.result = self.process_chunk(ds, *args, **kwargs)
> >   File
> "/Users/goldbaum/Documents/yt-hg/yt/data_objects/derived_quantities.py",
> line 169, in process_chunk
> >     for field in fields]
> >   File
> "/Users/goldbaum/Documents/yt-hg/yt/data_objects/data_containers.py", line
> 205, in __getitem__
> >     f = self._determine_fields([key])[0]
> >   File
> "/Users/goldbaum/Documents/yt-hg/yt/data_objects/data_containers.py", line
> 464, in _determine_fields
> >     raise YTFieldTypeNotFound(ftype)
> > yt.utilities.exceptions.YTFieldTypeNotFound: Could not find field 'all'.
> > ```
> >
> >
> >
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