AttributeError from db.hs

[prjemian]

This line: https://github.com/BCDA-APS/apstools/blob/master/apstools/examples.py#L63 generates this error:

AttributeError: hs

Comes from here: https://github.com/bluesky/databroker/blob/0366a8925d50076de7ab9327fcc7e9e19dc8fd57/databroker/_core.py#L902-L912

which means this must change due to changes in databroker

[danielballan]

It looks like our tests didn't cover this, so it was passed over in our efforts to make databroker.v1.Broker match the API of databroker.v0.Broker. If you think this will come up many places, we can add an hs accessor to match the v0 API, but if changing db.hs.find_run_starts to db() (the standard v1 way) or db.v2.search (the recommended v2 way) fixes the issue, that would be the easier path for us.

[prjemian]

Since apstools.utils.listruns() provides this capability, the example function should be removed.