我通过this精彩的视频教程开始使用Django。在视频系列的教程15中，使用南进行数据库迁移。但是当我做python manage.py migrate signups时，我遇到了很多错误。第一个错误是：
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 164, i
n _run_migration
for name, db in south.db.dbs.iteritems():
AttributeError: 'dict' object has no attribute 'iteritems'
我将iteritems()更改为items()以解决此问题，但是还会出现很多其他错误。我的猜测是它与行动中的版本有关 - South==1.0 Django == 1.6.5 and Python 3.4.1
以下是我的 models.py 的内容，for_you, timestamp, updated是迁移后添加的属性。最初注释掉了这些属性。
`from django.db import models
class SignUp(models.Model):
for_you = models.BooleanField(default = True)
first_name = models.CharField(max_length = 120, null=True, blank=True)
last_name = models.CharField(max_length = 120, null=True, blank=True)
email = models.EmailField()
timestamp = models.DateTimeField(auto_now_add = True, auto_now = False)
updated = models.DateTimeField(auto_now_add = False, auto_now = True, default=True)
#timestamp = models.DateTimeField(auto_now_add = False, auto_now = True)
#timestamp = models.DateTimeField(auto_now_add = True, auto_now = False)
def __str__(self):
return self.email`
自动生成的迁移/ 0002_auto__add_field_signup_for_you__add_field_signup_updated.py 看起来像
# -*- coding: utf-8 -*-
from south.utils import datetime_utils as datetime
from south.db import db
from south.v2 import SchemaMigration
from django.db import models
class Migration(SchemaMigration):
def forwards(self, orm):
# Adding field 'SignUp.for_you'
db.add_column('signups_signup', 'for_you',
self.gf('django.db.models.fields.BooleanField')(default=True),
keep_default=False)
# Adding field 'SignUp.updated'
db.add_column('signups_signup', 'updated',
self.gf('django.db.models.fields.DateTimeField')(blank=True, default=True, auto_now=True),
keep_default=False)
def backwards(self, orm):
# Deleting field 'SignUp.for_you'
db.delete_column('signups_signup', 'for_you')
# Deleting field 'SignUp.updated'
db.delete_column('signups_signup', 'updated')
models = {
'signups.signup': {
'Meta': {'object_name': 'SignUp'},
'email': ('django.db.models.fields.EmailField', [], {'max_length': '75'}),
'first_name': ('django.db.models.fields.CharField', [], {'blank': 'True', 'null': 'True', 'max_length': '120'}),
'for_you': ('django.db.models.fields.BooleanField', [], {'default': 'True'}),
'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
'last_name': ('django.db.models.fields.CharField', [], {'blank': 'True', 'null': 'True', 'max_length': '120'}),
'timestamp': ('django.db.models.fields.DateTimeField', [], {'blank': 'True', 'auto_now_add': 'True'}),
'updated': ('django.db.models.fields.DateTimeField', [], {'blank': 'True', 'default': 'True', 'auto_now': 'True'})
}
}
complete_apps = ['signups']
这是完整的错误日志：
Running migrations for signups:
- Migrating forwards to 0002_auto__add_field_signup_for_you__add_field_signup_u
pdated.
> signups:0002_auto__add_field_signup_for_you__add_field_signup_updated
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 175, i
n _run_migration
migration_function()
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 60, in
<lambda>
return (lambda: direction(orm))
File "D:\Projects\skillshare\src\signups\migrations\0002_auto__add_
field_signup_for_you__add_field_signup_updated.py", line 19, in forwards
keep_default=False)
File "C:\Python34\lib\site-packages\south\db\sqlite3.py", line 35, in add_colu
mn
field_default = "'%s'" % field.get_db_prep_save(default, connection=self._ge
t_connection())
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
350, in get_db_prep_save
prepared=False)
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
911, in get_db_prep_value
value = self.get_prep_value(value)
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
895, in get_prep_value
value = self.to_python(value)
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
854, in to_python
parsed = parse_datetime(value)
File "C:\Python34\lib\site-packages\django\utils\dateparse.py", line 67, in pa
rse_datetime
match = datetime_re.match(value)
TypeError: expected string or buffer
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line
399, in execute_from_command_line
utility.execute()
File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line
392, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Python34\lib\site-packages\django\core\management\base.py", line 242,
in run_from_argv
self.execute(*args, **options.__dict__)
File "C:\Python34\lib\site-packages\django\core\management\base.py", line 285,
in execute
output = self.handle(*args, **options)
File "C:\Python34\lib\site-packages\south\management\commands\migrate.py", lin
e 111, in handle
ignore_ghosts = ignore_ghosts,
File "C:\Python34\lib\site-packages\south\migration\__init__.py", line 220, in
migrate_app
success = migrator.migrate_many(target, workplan, database)
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 256, i
n migrate_many
result = migrator.__class__.migrate_many(migrator, target, migrations, datab
ase)
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 331, i
n migrate_many
result = self.migrate(migration, database)
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 133, i
n migrate
result = self.run(migration, database)
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 113, i
n run
dry_run.run_migration(migration, database)
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 192, i
n run_migration
self._run_migration(migration)
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 178, i
n _run_migration
raise exceptions.FailedDryRun(migration, sys.exc_info())
south.exceptions.FailedDryRun: ! Error found during dry run of '0002_auto__add_
field_signup_for_you__add_field_signup_updated'! Aborting.
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 175, i
n _run_migration
migration_function()
File "C:\Python34\lib\site-packages\south\migration\migrators.py", line 60, in
<lambda>
return (lambda: direction(orm))
File "D:\Projects\skillshare\src\signups\migrations\0002_auto__add_
field_signup_for_you__add_field_signup_updated.py", line 19, in forwards
keep_default=False)
File "C:\Python34\lib\site-packages\south\db\sqlite3.py", line 35, in add_colu
mn
field_default = "'%s'" % field.get_db_prep_save(default, connection=self._ge
t_connection())
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
350, in get_db_prep_save
prepared=False)
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
911, in get_db_prep_value
value = self.get_prep_value(value)
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
895, in get_prep_value
value = self.to_python(value)
File "C:\Python34\lib\site-packages\django\db\models\fields\__init__.py", line
854, in to_python
parsed = parse_datetime(value)
File "C:\Python34\lib\site-packages\django\utils\dateparse.py", line 67, in pa
rse_datetime
match = datetime_re.match(value)
TypeError: expected string or buffer
答案 0 :(得分：1)
存在这个问题，您使用布尔值作为default=True列的默认值（请参阅迁移中第19行的DateTime）。那不行。只需从模型中删除default=True并重新生成迁移。
您可能需要该列中的null=True或基于时间的默认值。
答案 1 :(得分：0)
在迁移过程中，fields.DateTimeField不能是布尔值（默认值= True）。
您可以编辑迁移设置日期时间值
import datetime
...
default = datetime.datetime(2016,2,25,16,35,658000)
...
models.DateTimeField应该是None或datetime对象