syncdb - ValueError: too many values to unpack - django

Question

UPDATE for close - I think I go through it and it was a bit of stupidity on my behalf.
python manage.py inspectdb > models.py
I was forgetting to pipe the output to a file!
I've dumped that into my app/models.py and now I'm just trying to get it running from there but going further.
I'm trying to get django running against an SQL Server 2008 R2 server.
I've figured out the FreeTDS/unixODBC connections. I can successfully do an isql and tsql query against the database.
I've been able to do a connection directly in python like so -
import pyodbc
cnxn = pyodbc.connect('DRIVER=FreeTDS;SERVER=servername;DATABASE=dbname;UID=user;PWD=pass;TDS_Version=8.0;')
cursor = cnxn.cursor()
result = cursor.execute("select name from tablea where name = 'hello'")
print result
If I do an inspectdb in django shell it's fine. It returns 70+ tables and their layout perfectly ok.
once I try to do a syndb it's spilling back the following error -
Creating tables ...
Creating table django_admin_log
Creating table auth_permission
Creating table auth_group_permissions
Creating table auth_group
Creating table auth_user_groups
Creating table auth_user_user_permissions
Creating table auth_user
Creating table django_content_type
Creating table django_session
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.6/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.6/dist-packages/django/core/management/__init__.py", line 392, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.6/dist-packages/django/core/management/base.py", line 242, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.6/dist-packages/django/core/management/base.py", line 285, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.6/dist-packages/django/core/management/base.py", line 415, in handle
return self.handle_noargs(**options)
File "/usr/local/lib/python2.6/dist-packages/django/core/management/commands/syncdb.py", line 112, in handle_noargs
emit_post_sync_signal(created_models, verbosity, interactive, db)
File "/usr/local/lib/python2.6/dist-packages/django/core/management/sql.py", line 216, in emit_post_sync_signal
interactive=interactive, db=db)
File "/usr/local/lib/python2.6/dist-packages/django/dispatch/dispatcher.py", line 185, in send
response = receiver(signal=self, sender=sender, **named)
File "/usr/local/lib/python2.6/dist-packages/django/contrib/auth/management/__init__.py", line 82, in create_permissions
ctype = ContentType.objects.db_manager(db).get_for_model(klass)
File "/usr/local/lib/python2.6/dist-packages/django/contrib/contenttypes/models.py", line 47, in get_for_model
defaults = {'name': smart_text(opts.verbose_name_raw)},
File "/usr/local/lib/python2.6/dist-packages/django/db/models/manager.py", line 154, in get_or_create
return self.get_queryset().get_or_create(**kwargs)
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 373, in get_or_create
return self.get(**lookup), False
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 301, in get
num = len(clone)
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 77, in __len__
self._fetch_all()
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 854, in _fetch_all
self._result_cache = list(self.iterator())
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 220, in iterator
for row in compiler.results_iter():
File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/compiler.py", line 710, in results_iter
for rows in self.execute_sql(MULTI):
File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/compiler.py", line 771, in execute_sql
sql, params = self.as_sql()
File "/usr/local/lib/python2.6/dist-packages/sql_server/pyodbc/compiler.py", line 48, in as_sql
self._get_ordering(out_cols, supports_offset_clause or not do_offset)
File "/usr/local/lib/python2.6/dist-packages/sql_server/pyodbc/compiler.py", line 154, in _get_ordering
ordering, ordering_group_by = self.get_ordering()
ValueError: too many values to unpack
similarily if I try to do a query in django like so -
from myapp.models import tablea
tablea.objects.filter(id=5)
It fails with the following error message -
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 71, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 96, in __iter__
self._fetch_all()
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 854, in _fetch_all
self._result_cache = list(self.iterator())
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 220, in iterator
for row in compiler.results_iter():
File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/compiler.py", line 710, in results_iter
for rows in self.execute_sql(MULTI):
File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/compiler.py", line 771, in execute_sql
sql, params = self.as_sql()
File "/usr/local/lib/python2.6/dist-packages/sql_server/pyodbc/compiler.py", line 48, in as_sql
self._get_ordering(out_cols, supports_offset_clause or not do_offset)
File "/usr/local/lib/python2.6/dist-packages/sql_server/pyodbc/compiler.py", line 154, in _get_ordering
ordering, ordering_group_by = self.get_ordering()
ValueError: too many values to unpack
I'm not convinced these errors are related to the other thread found here -
ValueError: Too many values to unpack Django
But I'm no expert so I could be wrong. I know I did try to change my password and it won't let me connect similar error message -
>>> u = User.objects.get(username="user")
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/local/lib/python2.6/dist-packages/django/db/models/manager.py", line 151, in get
return self.get_queryset().get(*args, **kwargs)
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 301, in get
num = len(clone)
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 77, in __len__
self._fetch_all()
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 854, in _fetch_all
self._result_cache = list(self.iterator())
File "/usr/local/lib/python2.6/dist-packages/django/db/models/query.py", line 220, in iterator
for row in compiler.results_iter():
File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/compiler.py", line 710, in results_iter
for rows in self.execute_sql(MULTI):
File "/usr/local/lib/python2.6/dist-packages/django/db/models/sql/compiler.py", line 771, in execute_sql
sql, params = self.as_sql()
File "/usr/local/lib/python2.6/dist-packages/sql_server/pyodbc/compiler.py", line 48, in as_sql
self._get_ordering(out_cols, supports_offset_clause or not do_offset)
File "/usr/local/lib/python2.6/dist-packages/sql_server/pyodbc/compiler.py", line 154, in _get_ordering
ordering, ordering_group_by = self.get_ordering()
ValueError: too many values to unpack
edit to add - when doing a query my model definition is as follows -
from django.db import models
# Create your models here.
class tablea(models.Model):
tablea_id = models.IntegerField()
tablea_name = models.CharField(max_length=32)
tablea_duration = models.IntegerField()
class Meta:
db_table = u'tablea'
def __unicode__(self):
return self.tablea_name, tablea_duration
edit to add that I've done a complete fresh reinstall. Wiped the VM and brought it back to life. Here's a breakdown of the steps done
apt-get install gcc g++ make python-dev
download unixODBC
tar xzvf unixODBC-2.3.2.tar.gz
./configure
make
makeinstall
download FreeTDS
tar xzvf freetds-stable.tgz
./configure --with-tdsver=8.0 --with-unixodbc=usr/local
make
make install
ldconfig -v
odbc.ini
[mssql]
Description = MSSQL Server
Driver = freetds
Database = database
Server = server
Port = 1433
TDS_Version = 8.0
odbcinst.ini
[freetds]
Description = MS SQL database access with Free TDS
Driver = /usr/local/lib/libtdsodbc.so
Setup = /usr/local/lib/libtdsS.so
UsageCount = 1
freetds.conf
[mssql]
host = server
port = 1433
tds version = 8.0
tsql -S mssql -U user -P password works
isql -v mssql user password works (for some reason simple isql -v mssql does not)
apt-get install python-setuptools
easy_install pip
pip install pyodbc
pip install Django==1.6
pip install django-pyodbc-azure
settings.py
DATABASES = {
'default': {
'ENGINE': 'sql_server.pyodbc',
'HOST': "server\instance",
'USER': "username",
'PASSWORD': "password",
'NAME': "database",
'OPTIONS': {
'host_is_server': True,
'driver': 'FreeTDS',
'dsn': 'MSSQL',
},
}
}

Answer 1

It's a version incompatibility issue.
Django 1.6 changed the kind of value returned by django.db.models.sql.compiler.SQLCompiler.get_ordering. It returns a 3-element tuple, but pyodbc unpacks just two elements.
If you look at Django 1.5 version you see that it used to return a 2-element tuple as pyodbc expects.