I've an established Django application that I'm finishing up a new release
for, and I'm working on solving any last python 3 issues.
I'm confused at what's happening here though...
Run manage.py migrations under v2.7x:
nerv:quickbbs Benjamin$ manage.py migrate --run-syncdb
Running on nerv.local
Operations to perform:
Synchronize unmigrated apps: _humanize, allauth, bootstrap3,
django_jinja, grappelli, humanize, messages, staticfiles
Apply all migrations: account, admin, auth, contenttypes, quickbbs,
sessions, sites, socialaccount
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Running migrations:
No migrations to apply.
Run manage.py migrations under v3.65.
(quickbbs) nerv:quickbbs Benjamin$ python3 manage.py migrate
Running on nerv.local
CommandError: Conflicting migrations detected; multiple leaf nodes in the
migration graph: (0019_auto_20171108_0155, 0044_auto_20180519_1914 in
quickbbs).
To fix them run 'python manage.py makemigrations --merge'
(quickbbs) nerv:quickbbs Benjamin$
Okay?
Manage.py makemigrations --merge
(quickbbs) nerv:quickbbs Benjamin$ python3 manage.py makemigrations --merge
Running on nerv.local
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File
"/Users/Benjamin/django-py3/quickbbs/lib/python3.6/site-packages/django/core/management/__init__.py",
line 371, in execute_from_command_line
utility.execute()
File
"/Users/Benjamin/django-py3/quickbbs/lib/python3.6/site-packages/django/core/management/__init__.py",
line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/Users/Benjamin/django-py3/quickbbs/lib/python3.6/site-packages/django/core/management/base.py",
line 288, in run_from_argv
self.execute(*args, **cmd_options)
File
"/Users/Benjamin/django-py3/quickbbs/lib/python3.6/site-packages/django/core/management/base.py",
line 335, in execute
output = self.handle(*args, **options)
File
"/Users/Benjamin/django-py3/quickbbs/lib/python3.6/site-packages/django/core/management/commands/makemigrations.py",
line 124, in handle
return self.handle_merge(loader, conflicts)
File
"/Users/Benjamin/django-py3/quickbbs/lib/python3.6/site-packages/django/core/management/commands/makemigrations.py",
line 251, in handle_merge
raise ValueError("Could not find common ancestor of %s" %
migration_names)
ValueError: Could not find common ancestor of {'0019_auto_20171108_0155',
'0044_auto_20180519_1914'}
I have found several other people reporting similar issues, but I don't see
any best practices to prevent this, and no straight forward explanations on
how to fix this?
But my big question is why is this happening with Py3, and not Py2?
- Benjamin
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