AttributeError:模型对象没有属性“rel”

在django 1.9中,我使用了这个自定义的多语言charfield,然后我升级到django 2.0,它在runserver上给出了错误:

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

错误如下:

(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,该属性不再存在了?我不知道它是什么,我需要什么。谢谢你的帮助。如果我把这句话注释掉,它看起来是有效的。。。但我不确定它将来会做什么。。。

编辑:

所以,是的 deprecated (同时 here ),有人知道我该怎么做吗?我试着换线 contribute_to_class (见上文)在:

...
#rel=self.rel,
remote_field=self.remote_field,
...

但它给出了一个错误 .../models/__init__.py :

TypeError: __init__() got an unexpected keyword argument 'remote_field'

完整回溯:

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'