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使用解决方案 here为了验证 URLField,我在运行 python manage.py makemigrations
时收到 ValueError,我不确定为什么。我做错了什么?
from django.contrib.auth.models import User
from django.db import models
from django.core.exceptions import ValidationError
from urllib.parse import urlparse
def validate_hostname(*hostnames):
hostnames = set(hostnames)
def validator(value):
try:
result = urlparse(value)
if result.hostname not in hostnames:
raise ValidationError(f'The hostname {result.hostname} is not allowed.')
except ValueError:
raise ValidationError('Invalid URL')
return validator
class UserProfile(models.Model):
user = models.OneToOneField(User, on_delete=models.SET_NULL, null=True)
twitter = models.URLField(
blank=True,
null=True,
validators=[validate_hostname('twitter.com', 'www.twitter.com')]
)
回溯
$ python manage.py makemigrations
Migrations for 'userprofiles':
userprofiles/migrations/0002_userprofile_twitter.py
- Add field twitter to userprofile
Traceback (most recent call last):
File "/home/master/github/mywebsite/src/manage.py", line 22, in <module>
main()
File "/home/master/github/mywebsite/src/manage.py", line 18, in main
execute_from_command_line(sys.argv)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/__init__.py", line 446, in execute_from_command_line
utility.execute()
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/__init__.py", line 440, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/base.py", line 414, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/base.py", line 460, in execute
output = self.handle(*args, **options)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/base.py", line 98, in wrapped
res = handle_func(*args, **kwargs)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/commands/makemigrations.py", line 214, in handle
self.write_migration_files(changes)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/core/management/commands/makemigrations.py", line 255, in write_migration_files
migration_string = writer.as_string()
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/writer.py", line 141, in as_string
operation_string, operation_imports = OperationWriter(operation).serialize()
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/writer.py", line 99, in serialize
_write(arg_name, arg_value)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/writer.py", line 63, in _write
arg_string, arg_imports = MigrationWriter.serialize(_arg_value)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/writer.py", line 282, in serialize
return serializer_factory(value).serialize()
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/serializer.py", line 216, in serialize
return self.serialize_deconstructed(path, args, kwargs)
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/serializer.py", line 94, in serialize_deconstructed
arg_string, arg_imports = serializer_factory(arg).serialize()
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/serializer.py", line 43, in serialize
item_string, item_imports = serializer_factory(item).serialize()
File "/home/master/.cache/pypoetry/virtualenvs/mywebsite-WMQVlvmt-py3.10/lib/python3.10/site-packages/django/db/migrations/serializer.py", line 172, in serialize
raise ValueError(
ValueError: Could not find function validator in userprofiles.models.
最佳答案
这可以通过添加 functools.wraps
来解决。装饰:
from functools import wraps
[...]
def validate_hostname(*hostnames):
[...]
@wraps(validate_hostname)
def validator(value):
[...]
return validator
关于django - 值错误 : Could not find function validator when calling makemigrations in Django 4. 0,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/71711826/
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