在django 1.9中我使用了这个自定义MultilingualCharField，然后我升级到django 2.0并且它在runserver上出错：
class MultilingualCharField(models.CharField):
def __init__(self, verbose_name=None, **kwargs):
self._blank = kwargs.get("blank", False)
self._editable = kwargs.get("editable", True)
#super(MultilingualCharField, self).__init__(verbose_name, **kwargs)
super().__init__(verbose_name, **kwargs)
def contribute_to_class(self, cls, name, virtual_only=False):
# generate language specific fields dynamically
if not cls._meta.abstract:
for lang_code, lang_name in settings.LANGUAGES:
if lang_code == settings.LANGUAGE_CODE:
_blank = self._blank
else:
_blank = True
localized_field = models.CharField(string_concat(
self.verbose_name, " (%s)" % lang_code),
name=self.name,
primary_key=self.primary_key,
max_length=self.max_length,
unique=self.unique,
blank=_blank,
null=False,
# we ignore the null argument!
db_index=self.db_index,
rel=self.rel,
default=self.default or "",
editable=self._editable,
serialize=self.serialize,
choices=self.choices,
help_text=self.help_text,
db_column=None,
db_tablespace=self.db_tablespace
)
localized_field.contribute_to_class(cls,
"%s_%s" % (name, lang_code),)
def translated_value(self):
language = get_language()
val = self.__dict__["%s_%s" % (name, language)]
if not val:
val = self.__dict__["%s_%s" % (name, settings.LANGUAGE_CODE)]
return val
setattr(cls, name, property(translated_value))
def name(self):
name_translated='name'+settings.LANGUAGE_CODE
return name_translated
这是错误：
(possedimenti) D:\Python\progetti\possedimenti\sitopossedimenti>manage.py runserver
Unhandled exception in thread started by <function check_errors.<locals>.wrapper
at 0x03BCB8E8>
Traceback (most recent call last):
File "D:\Python\Envs\possedimenti\lib\site-packages\django\utils\autoreload.py
", line 225, in wrapper
fn(*args, **kwargs)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\core\management\com
mands\runserver.py", line 112, in inner_run
autoreload.raise_last_exception()
File "D:\Python\Envs\possedimenti\lib\site-packages\django\utils\autoreload.py
", line 248, in raise_last_exception
raise _exception[1]
File "D:\Python\Envs\possedimenti\lib\site-packages\django\core\management\__i
nit__.py", line 327, in execute
autoreload.check_errors(django.setup)()
File "D:\Python\Envs\possedimenti\lib\site-packages\django\utils\autoreload.py
", line 225, in wrapper
fn(*args, **kwargs)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\__init__.py", line
24, in setup
apps.populate(settings.INSTALLED_APPS)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\apps\registry.py",
line 112, in populate
app_config.import_models()
File "D:\Python\Envs\possedimenti\lib\site-packages\django\apps\config.py", li
ne 198, in import_models
self.models_module = import_module(models_module_name)
File "D:\python\lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 986, in _gcd_import
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 665, in exec_module
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
File "D:\Python\progetti\possedimenti\sitopossedimenti\core\models\__init__.py
", line 1, in <module>
from core.models.campaign import Source, Ability
File "D:\Python\progetti\possedimenti\sitopossedimenti\core\models\campaign.py
", line 6, in <module>
class Ability(models.Model):
File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\base.py",
line 152, in __new__
new_class.add_to_class(obj_name, obj)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\base.py",
line 315, in add_to_class
value.contribute_to_class(cls, name)
File "D:\Python\progetti\possedimenti\sitopossedimenti\sitopossedimenti\utils.
py", line 45, in contribute_to_class
rel=self.rel,
AttributeError: 'MultilingualCharField' object has no attribute 'rel'
也许在django 2.0中，该属性不再存在？我不知道它是什么以及我需要什么。谢谢您的帮助。如果我注释掉那条线似乎正在工作......但是我不确定它将来会做些什么...
修改
所以，它是deprecated（也是here），任何人都知道我应该做什么？我试图更改contribute_to_class中的行（见上文）：
...
#rel=self.rel,
remote_field=self.remote_field,
...
但它在.../models/__init__.py：
TypeError: __init__() got an unexpected keyword argument 'remote_field'
完成追溯：
Unhandled exception in thread started by <function check_errors.<locals>.wrapper
at 0x03BF0108>
Traceback (most recent call last):
File "D:\Python\Envs\possedimenti\lib\site-packages\django\utils\autoreload.py
", line 225, in wrapper
fn(*args, **kwargs)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\core\management\com
mands\runserver.py", line 112, in inner_run
autoreload.raise_last_exception()
File "D:\Python\Envs\possedimenti\lib\site-packages\django\utils\autoreload.py
", line 248, in raise_last_exception
raise _exception[1]
File "D:\Python\Envs\possedimenti\lib\site-packages\django\core\management\__i
nit__.py", line 327, in execute
autoreload.check_errors(django.setup)()
File "D:\Python\Envs\possedimenti\lib\site-packages\django\utils\autoreload.py
", line 225, in wrapper
fn(*args, **kwargs)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\__init__.py", line
24, in setup
apps.populate(settings.INSTALLED_APPS)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\apps\registry.py",
line 112, in populate
app_config.import_models()
File "D:\Python\Envs\possedimenti\lib\site-packages\django\apps\config.py", li
ne 198, in import_models
self.models_module = import_module(models_module_name)
File "D:\python\lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 986, in _gcd_import
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 665, in exec_module
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
File "D:\Python\progetti\possedimenti\sitopossedimenti\core\models\__init__.py
", line 1, in <module>
from core.models.campaign import Source, Ability
File "D:\Python\progetti\possedimenti\sitopossedimenti\core\models\campaign.py
", line 6, in <module>
class Ability(models.Model):
File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\base.py",
line 152, in __new__
new_class.add_to_class(obj_name, obj)
File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\base.py",
line 315, in add_to_class
value.contribute_to_class(cls, name)
File "D:\Python\progetti\possedimenti\sitopossedimenti\sitopossedimenti\utils.
py", line 53, in contribute_to_class
db_tablespace=self.db_tablespace
File "D:\Python\Envs\possedimenti\lib\site-packages\django\db\models\fields\__
init__.py", line 1042, in __init__
super().__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'remote_field'
答案 0 :(得分：2)
我最终遇到了类似或相关的问题：
File "XXX/.virtualenv/lib/python3.4/site-packages/natural_keys/models.py", line 168, in natural_key
for name in self.get_natural_key_fields()]
File "XXX/.virtualenv/lib/python3.4/site-packages/natural_keys/models.py", line 149, in get_natural_key_fields
for name, rel_to in cls.get_natural_key_info():
File "XXX/.virtualenv/lib/python3.4/site-packages/natural_keys/models.py", line 129, in get_natural_key_info
rel_to = field.rel.to if field.rel else None
AttributeError: 'CharField' object has no attribute 'rel'
不确定这是否有助于解决问题。