Hi Nathan, This was by design -- whether that was right or not -- because I wanted to allow all of the objects to be created without requiring an index, until data was accessed. Specifically this fails because TotalMass accesses field_info directly instead of via _get_field_info. -Matt On Tue, Apr 1, 2014 at 8:02 PM, Nathan Goldbaum <issues-reply@bitbucket.org> wrote:
New issue 825: Creating an all_data object does not generate the field_info object. https://bitbucket.org/yt_analysis/yt/issue/825/creating-an-all_data-object-d...
Nathan Goldbaum:
The following script and traceback illustrates the issue:
``` #!python
import yt
ds = yt.load('IsolatedGalaxy/galaxy0030/galaxy0030')
ad = ds.all_data()
print ad.quantities.total_mass() ```
``` File "test.py", line 7, in <module> print ad.quantities.total_mass() File "/Users/goldbaum/Documents/yt-hg/yt/data_objects/derived_quantities.py", line 188, in __call__ fi = self.data_source.pf.field_info AttributeError: 'EnzoDataset' object has no attribute 'field_info'
```
Adding a call to ds.index before the call to the `total_mass` derived quantity eliminates the error.
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