Django 中的内容翻译，兼容 South

Question

我正在寻找一种在 Django 中具有可翻译数据库字段的解决方案，并且该解决方案需要与 South 兼容。

我已经找到了 django-transmeta 和 transdb。只有后者似乎与南方兼容，但我对此不确定。另外，transdb 值在数据库中看起来不太好（这是客户真正关心的）。

有人使用过这样的组合吗？我并不特别关注 South，但这似乎是 Django 中模式迁移的方法。

Answer 1

我认为这两个应用程序使用自定义字段，而 South 对此有所抱怨。您可以在此处了解如何为这些自定义字段启用南：http://south.aeracode.org /docs/customfields.html。

两个相关链接：

• THE DJANGO ORM 和多语言数据库内容（Djangocon 2011 上的演讲）
• http://djangopackages.com/grids/g/i18n/

Answer 2

因为我们确实知道语言的数量永远不会改变，所以我们转而为每种语言提供字段以及自动读取当前语言的正确字段的简单机制。我们的实现是这样使用的：

class Question(models.Model):
    __metaclass__ = LocalizeModelBase

    text_de = models.TextField(verbose_name=_(u"question text (german)"))
    text_en = models.TextField(verbose_name=_(u"question text (english)"))
    text = Translate

Question().text 然后根据当前语言自动返回正确的字段，并回退到默认语言。

它背后的实现应该是不言自明的：

from django.db.models.base import ModelBase
from django.utils.translation import get_language
from django.conf import settings

__all__ = ('Translate', 'LocalizeModelBase')

# a dummy placeholder object
Translate = object()


class LocalizeModelBase(ModelBase):
    """This meta-class provides automatically translated content properties. Set
    a model field to `Translate` and it will automatically return the property
    with the name of the current language. E.g. if there is a normal member
    `text_de`, a member `text = Translate` and the current language is `de`, then
    an object will return the content of `text_de` when it is asked for the value
    of `text`.
    """
    def __new__(metacls, classname, bases, classDict):
        # find all classDict entries that point to `Translate`
        for key in classDict.keys():
            if classDict[key] is Translate:
                # replace them with a getter that uses the current language
                classDict[key] = make_property(key)
        return super(LocalizeModelBase, metacls).__new__(metacls, classname, bases, classDict)


def make_property(k):
    """Creates a new property that implements the automatic translation
    described above. Every use of `Translate` in a class definition will be
    replaces with a property returned by this function."""
    def pget(self):
        try:
            # try to return the attribute for the current language
            return getattr(self, "%s_%s" % (k, get_language()))
        except AttributeError:
            # use the default language if the current language is not available
            return getattr(self, "%s_%s" % (k, settings.LANGUAGE_CODE))
    return property(pget)