example parallel failure

gistfile1.txt

======================================================================
ERROR: test_search_name (foodsaving.groups.tests.test_groups_api_filter.TestGroupsAPIFilter)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.6/unittest/suite.py", line 163, in _handleClassSetUp
    setUpClass()
  File "/home/tic/yunity/yunity-core/foodsaving/groups/tests/test_groups_api_filter.py", line 19, in setUpClass
    cls.group = GroupFactory(members=[cls.member, ])
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/factory/base.py", line 46, in __call__
    return cls.create(**kwargs)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/factory/base.py", line 568, in create
    return cls._generate(enums.CREATE_STRATEGY, kwargs)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/factory/base.py", line 505, in _generate
    return step.build()
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/factory/builder.py", line 279, in build
    kwargs=kwargs,
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/factory/base.py", line 314, in instantiate
    return self.factory._create(model, *args, **kwargs)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/factory/django.py", line 165, in _create
    return manager.create(*args, **kwargs)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/query.py", line 394, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/base.py", line 807, in save
    force_update=force_update, update_fields=update_fields)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/base.py", line 847, in save_base
    update_fields=update_fields, raw=raw, using=using,
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/dispatch/dispatcher.py", line 193, in send
    for receiver in self._live_receivers(sender)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/dispatch/dispatcher.py", line 193, in <listcomp>
    for receiver in self._live_receivers(sender)
  File "/home/tic/yunity/yunity-core/foodsaving/groups/receivers.py", line 34, in group_created
    conversation = Conversation.objects.get_or_create_for_target(group)
  File "/home/tic/yunity/yunity-core/foodsaving/conversations/models.py", line 18, in get_or_create_for_target
    return Conversation.objects.get_for_target(target) or Conversation.objects.create(target=target)
  File "/home/tic/yunity/yunity-core/foodsaving/conversations/models.py", line 14, in get_for_target
    target_type=ContentType.objects.get_for_model(target)).first()
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/query.py", line 564, in first
    objects = list((self if self.ordered else self.order_by('pk'))[:1])
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/query.py", line 250, in __iter__
    self._fetch_all()
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/query.py", line 1118, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/query.py", line 53, in __iter__
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 894, in execute_sql
    raise original_exception
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 884, in execute_sql
    cursor.execute(sql, params)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/raven/contrib/django/client.py", line 114, in execute
    return real_execute(self, sql, params)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
    return self.cursor.execute(sql, params)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/utils/six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "/home/tic/yunity/yunity-core/env/lib/python3.6/site-packages/django/db/backends/utils.py", line 65, in execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: column conversations_conversation.target_type_id does not exist
LINE 1: ...."id", "conversations_conversation"."created_at", "conversat...
                                                             ^

django.db.utils.ProgrammingError: column conversations_conversation.target_type_id does not exist

I had some of these before, but I think it was due to using --keepdb with a database with old/incorrect schema.