# Thursday, July 23, 2015¶

## ‘NoneType’ object has no attribute ‘get_detail_action’¶

A surprise in the morning: I wanted to start working, but my Noi told me above error message. The traceback showed that it came from the following line of code (in lino.modlib.stars.models.welcome_messages()):

chunks += join_elems([ar.obj2html(obj.owner) for obj in qs])


Explanation: Yesterday I had created duplicate tickets 348 and 349 due to bug #219. I had already starred ticket 348 before noticing that it was duplicated. Then I deleted it. Lino did not delete the Star object -and did not refuse to delete the starred ticket- because controller_is_optional on Star was at its default value True. Since this traceback happened while building admin_main.html, the web interface was not usable. Here is the little script which I used to repair the database and get it back to work:

from lino.api.shell import *
qs = stars.Star.objects.filter(owner_type__isnull=True)
print [obj.owner for obj in qs]  # []
qs = stars.Star.objects.all()
#print qs
#print [obj.owner_type for obj in qs]
print [obj.owner for obj in qs]
a = [obj for obj in qs if obj.owner is None]
assert len(a) == 1
a = a[0]
print a.owner, a.owner_type, a.owner_id
a.delete()


The bug was not abovementioned line of text but the fact that the owner field was optional.

## Optimizing lino.utils.html2rst¶

Continued with #351: repair test suites and optimize lino.utils.html2rst.