Question

在＃34; model＆＃34;上应用makmigration时没有问题。但迁移命令抛出异常＆＃34;错误＆＃34; ValueError：int（）的基数为10的无效文字：＆＃39; null＆＃39;。当我对＃34; emails_for_help＆＃34;进行更改时，我收到此错误帮助领域我尝试过fake_migration并迁移但没有用

模型

class Setup_user(models.Model):
organization=models.CharField(max_length=200,blank=False,default="")
email_id=models.EmailField(unique=True)
CEO = 'CEO'
GENERAL_MANAGER = 'GM'
JCHOICES = (
    (CEO, 'CEO'),
    (GENERAL_MANAGER, 'General Manager'),
            )
Designation = models.CharField(max_length=5,choices=JCHOICES)
LEVEL1 = "L1"
LEVEL2 = "L2"
LCHOICES = (
    (LEVEL1,"Level 1"),
    (LEVEL2,"Level 2"),
)
job_level=models.CharField(max_length=2,choices=LCHOICES)
EMAIL_CHOICES = ((str(q.email), str(q.email)) for q in User.objects.all())
emails_for_help = MultiSelectField(choices=EMAIL_CHOICES,default="null",max_length=5000,help_text="select with whom you want to share knowledge")

def __str__(self):
    return self.email_id

错误：

C:\Users\Ekatech7\PycharmProjects\baseproject>python manage.py migrate
 Operations to perform:
Apply all migrations: admin, auth, contenttypes, pkm_app, sessions
Running migrations:
Applying pkm_app.0015_auto_20180417_1723...Traceback (most recent call 
last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\core\management\__init__.py", line 371, in 
execute_from_command_line
utility.execute()
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\core\management\__init__.py", line 365, in execute
 self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\core\management\base.py", line 288, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\core\management\base.py", line 335, in execute
output = self.handle(*args, **options)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\core\management\commands\migrate.py", line 200, in handle
fake_initial=fake_initial,
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\migrations\executor.py", line 117, in migrate
 state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, 
fake_initial=fake_initial)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\migrations\executor.py", line 147, in 
_migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, 
fake_initial=fake_initial)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\migrations\executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\migrations\migration.py", line 122, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, 
project_state)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\migrations\operations\fields.py", line 84, in 
database_forwards
field,
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\backends\sqlite3\schema.py", line 306, in add_field
self._remake_table(model, create_field=field)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site  - 
packages\django\db\backends\sqlite3\schema.py", line 178, in _remake_table
self.effective_default(create_field)
File "C:\Users\Ekatech7\PycharmProjects\baseproject\venv\lib\site- 
packages\django\db\backends\base\schema.py", line 224, in effective_default
default = field.get_db_prep_save(default, self.connection)

文件＆＃34; C：\ Users \ Ekatech7 \ PycharmProjects \ baseproject \ venv \ lib \ site- 在get_db_prep_save中的packages \ django \ db \ models \ fields \ related.py＆＃34;，第936行 return self.target_field.get_db_prep_save（value，connection = connection）文件＆＃34; C：\ Users \ Ekatech7 \ PycharmProjects \ baseproject \ venv \ lib \ site- 在get_db_prep_save中的packages \ django \ db \ models \ _字段_init __。py＆＃34;，第767行 return self.get_db_prep_value（value，connection = connection，prepared = False）文件＆＃34; C：\ Users \ Ekatech7 \ PycharmProjects \ baseproject \ venv \ lib \ site- packages \ django \ db \ models \ fields__init __。py＆＃34;，第939行，in get_db_prep_value value = self.get_prep_value（value）文件＆＃34; C：\ Users \ Ekatech7 \ PycharmProjects \ baseproject \ venv \ lib \ site- 在get_prep_value中的packages \ django \ db \ models \ _字段_init __。py＆＃34;，第947行 return int（value） ValueError：int（）的基数为10的无效文字：＆＃39; null＆＃39;

Answer 1

您的CHOICES没有”null”作为选项。如果要存储空值，则必须设置null=True，这意味着当modelField为blank=True时，空值将存储为空。如果您只是希望表单在加载时不选择选项，请不要设置default。错误正在寻找：

EMAIL_CHOICES = (
    (“null”, “null”)
    (str(q.email), str(q.email)
    )

我认为你的for循环也向后倾斜。我相信它应该是：

for q in User.objects.all():
    (str(q.email), str(q.email)

Answer 2

问题已解决。我选择在上述模型中选择的方法是错误的错误。它通过使用多个关系来解决“电子邮件帮助”列和带有查询集approch的模型。

class Set_User_Form(ModelForm):
emails_for_help= forms.ModelMultipleChoiceField(queryset=User.objects.all(),widget=forms.CheckboxSelectMultiple)
class Meta:
    model=Setupuser
    exclude=["email_id"]

当应用makmigration＆＃34; model＆＃34;但迁移命令抛出异常＆＃34;错误＆＃34;

2 个答案: