On 22/10/2015 10:40 PM, Christoph Knapp wrote:
Hi,
I have a legacy database and used "python manage.py inspectdb >
models.py" to create a models.py file. After I modified the file all
errors went away when I makemigrations. This step works without problems
on the only app I have in my project. When I go "python manage.py
migrate" I get the following error.
Operations to perform:
 Synchronize unmigrated apps: staticfiles, messages
 Apply all migrations: admin, contenttypes, sessions, auth, readDatabase
Synchronizing apps without migrations:
 Creating tables...
   Running deferred SQL...
 Installing custom SQL...
Running migrations:
 Rendering model states... DONE
 Applying readDatabase.0001_initial...Traceback (most recent call last):
 File
"/home/christoph_knapp/Bioinformatik/variantendatenbank_tool/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 351, in execute_from_command_line
   utility.execute()
 File
"/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py",
line 343, 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 394, in run_from_argv
   self.execute(*args, **cmd_options)
 File
"/usr/local/lib/python2.7/dist-packages/django/core/management/base.py",
line 445, in execute
   output = self.handle(*args, **options)
 File
"/usr/local/lib/python2.7/dist-packages/django/core/management/commands/migrate.py",
line 222, 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 148, 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/models.py",
line 59, in database_forwards
   schema_editor.create_model(model)
 File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/base/schema.py",
line 286, in create_model
   self.execute(sql, params or None)
 File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/base/schema.py",
line 111, in execute
   cursor.execute(sql, params)
 File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py",
line 79, in execute
   return super(CursorDebugWrapper, self).execute(sql, params)
 File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py",
line 64, in execute
   return self.cursor.execute(sql, params)
 File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py",
line 97, in __exit__
   six.reraise(dj_exc_type, dj_exc_value, traceback)
 File
"/usr/local/lib/python2.7/dist-packages/django/db/backends/utils.py",
line 62, in execute
   return self.cursor.execute(sql)
django.db.utils.ProgrammingError: FEHLER: Relation „auth_group“
existiert bereits
The last line contains a little bit of German which translates into
"Relation "auth_group" already exists". The auth_group table was
generated by inspectdb and is none of the tables from the legacy
database. The only change I made at those tables were that I removed the
line "managed=False". When I put this back in I get the same error. The
python code for the auth_group table is below.
class AuthGroup(models.Model):
   name = models.CharField(unique=True, max_length=80)
   class Meta:
       db_table = 'auth_group'
auth_group is a Django table which you don't need to install. In your
models.py remove all models except your own, drop the database and try
again. The models/tables created for you by Django and the Admin are ...
auth_group
auth_group_permissions
auth_permission
auth_user
auth_user_groups
auth_user_user_permissions
django_admin_log
django_contenttype
django_migrations
django_session
Cheers
Mike
I just started with django, so let me know whether you need anything else.
Regards
Christoph
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