#31219: PROTECT may crash in some situations
-------------------------------------+-------------------------------------
               Reporter:  Matthias   |          Owner:  nobody
  Kestenholz                         |
                   Type:  Bug        |         Status:  new
              Component:  Database   |        Version:  master
  layer (models, ORM)                |
               Severity:  Normal     |       Keywords:
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 {{{
 ======================================================================
 ERROR: test_protect_via (delete.tests.OnDeleteTests)
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "/usr/lib/python3.6/unittest/case.py", line 59, in testPartExecutor
     yield
   File "/usr/lib/python3.6/unittest/case.py", line 605, in run
     testMethod()
   File "/home/matthias/Projects/django/tests/delete/tests.py", line 99, in
 test_protect_via
     p.delete()
   File "/home/matthias/Projects/django/django/db/models/base.py", line
 941, in delete
     collector.collect([self], keep_parents=keep_parents)
   File "/home/matthias/Projects/django/django/db/models/deletion.py", line
 300, in collect
     error.protected_objects[0].__class__.__name__,
 TypeError: 'itertools.chain' object is not subscriptable
 }}}

 Pull request follows.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/31219>
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