Hi everyone, I'm a new user, please help me if you have time, I'm very
appreciate.
My Django version is 1.8.0
I have User model it has friends list which is many to many type, the code
like this:
friends = models.ManyToManyField("self")
When I use command migrate to update database, the exception happened. The
information showing like this:
Operations to perform:
Synchronize unmigrated apps: staticfiles, rest_framework, messages,
geoposition
Apply all migrations: admin, normalUserFunctions, contenttypes, auth,
sessions
Synchronizing apps without migrations:
Creating tables...
Running deferred SQL...
Installing custom SQL...
Running migrations:
Rendering model states... DONE
Applying normalUserFunctions.0003_auto_20150519_0728...Traceback (most
recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File
"/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py",
line 338, in execute_from_command_line
utility.execute()
File
"/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py",
line 330, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/usr/local/lib/python2.7/dist-packages/django/core/management/base.py",
line 390, in run_from_argv
self.execute(*args, **cmd_options)
File
"/usr/local/lib/python2.7/dist-packages/django/core/management/base.py",
line 441, in execute
output = self.handle(*args, **options)
File
"/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py",
line 221, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File
"/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py",
line 110, in migrate
self.apply_migration(states[migration], migration, fake=fake,
fake_initial=fake_initial)
File
"/usr/local/lib/python2.7/dist-packages/django/db/migrations/executor.py",
line 147, in apply_migration
state = migration.apply(state, schema_editor)
File
"/usr/local/lib/python2.7/dist-packages/django/db/migrations/migration.py",
line 115, in apply
operation.database_forwards(self.app_label, schema_editor, old_state,
project_state)
File
"/usr/local/lib/python2.7/dist-packages/django/db/migrations/operations/fields.py",
line 201, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/base/schema.py",
line 469, in alter_field
return self._alter_many_to_many(model, old_field, new_field, strict)
File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/base/schema.py",
line 785, in _alter_many_to_many
old_field.rel.through._meta.get_field(old_field.m2m_field_name()),
File
"/usr/local/lib/python2.7/dist-packages/django/db/models/options.py", line
554, in get_field
raise FieldDoesNotExist('%s has no field named %r' % (self.object_name,
field_name))
django.core.exceptions.FieldDoesNotExist: User_friends has no field named
None
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