Created
March 23, 2012 09:10
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simple Django model localization
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| 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) |
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