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I updated django-dynamic-model repository to support Django 1.9. I got this error:
CommandError:
Conflicting migrations detected; multiple leaf nodes in the migration
graph: (0001_initial, 0002_auto__add_field_dynamicschemafield_extra in
dynamicmodel).
To fix them run 'python manage.py makemigrations --merge'
After running python manage.py makemigrations --merge, I got another error:
File "/local/lib/python2.7/sitepackages/django/core/management/__init__.py",
line 353, in execute_from_command_line
utility.execute()
File "/local/lib/python2.7/sitepackages/django/core/management/__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/local/lib/python2.7/site-packages/django/core/management/base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File
"/local/lib/python2.7/site-packages/django/core/management/base.py", line 399, in execute
output = self.handle(*args, **options)
File
"/local/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 97, in handle
return self.handle_merge(loader, conflicts)
File
"/local/lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 216, in handle_merge
raise ValueError("Could not find common ancestor of %s" % migration_names)
ValueError: Could not find common ancestor of set([u'0001_initial', u'0002_auto__add_field_dynamicschemafield_extra']).
Help me to find the solution.
405
you can either: temporarily remove your migration, execute python manage.py migrate, add again your migration and re-execute python manage.py migrate. Use this case if the migrations refer to different models and you want different migration files for each one of them.
One option is using the MIGRATION_MODULES setting, which is intended to define a custom name for an app's migration module. If you set None instead, Django will ignore the migration module.
To recap, the basic steps to use Django migrations look like this: Create or update a model. Run ./manage.py makemigrations <app_name> Run ./manage.py migrate to migrate everything or ./manage.py migrate <app_name> to migrate an individual app.
The migrations need to have "straight" dependency chain, i.e. migration 0003 needs to depend on migration 0002, and 0002 on 0001.
You need to define this in the 0003_third.py like this:
class Migration(migrations.Migration):
dependencies = [
('modulename', '0002_second'),
]
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