models.py 文件源码

def get_canonical(cls, language_code):
        """Returns the canonical `Language` object matching `language_code`.

        If no language can be matched, `None` will be returned.

        :param language_code: the code of the language to retrieve.
        """
        try:
            return cls.objects.get(code__iexact=language_code)
        except cls.DoesNotExist:
            _lang_code = language_code
            if "-" in language_code:
                _lang_code = language_code.replace("-", "_")
            elif "_" in language_code:
                _lang_code = language_code.replace("_", "-")
            try:
                return cls.objects.get(code__iexact=_lang_code)
            except cls.DoesNotExist:
                return None