def __get__(self, instance, owner):
     """
     Returns value from the translation field for the current language, or
     value for some another language according to fallback languages, or the
     custom fallback value, or field's default value.
     """
     if instance is None:
         return self
     default = NONE
     undefined = self.fallback_undefined
     if undefined is NONE:
         default = self.field.get_default()
         undefined = default
     langs = resolution_order(get_language(), self.fallback_languages)
     for lang in langs:
         loc_field_name = build_localized_fieldname(self.field.name, lang)
         val = getattr(instance, loc_field_name, None)
         if self.meaningful_value(val, undefined):
             return val
     if mt_settings.ENABLE_FALLBACKS and self.fallback_value is not NONE:
         return self.fallback_value
     else:
         if default is NONE:
             default = self.field.get_default()
         # Some fields like FileField behave strange, as their get_default() doesn't return
         # instance of attr_class, but rather None or ''.
         # Normally this case is handled in the descriptor, but since we have overridden it, we
         # must mock it up.
         if (isinstance(self.field, fields.files.FileField)
                 and not isinstance(default, self.field.attr_class)):
             return self.field.attr_class(instance, self.field, default)
         return default
 def __get__(self, instance, owner):
     """
     Returns value from the translation field for the current language, or
     value for some another language according to fallback languages, or the
     custom fallback value, or field's default value.
     """
     if instance is None:
         return self
     default = NONE
     undefined = self.fallback_undefined
     if undefined is NONE:
         default = self.field.get_default()
         undefined = default
     langs = resolution_order(get_language(), self.fallback_languages)
     for lang in langs:
         loc_field_name = build_localized_fieldname(self.field.name, lang)
         val = getattr(instance, loc_field_name, None)
         if self.meaningful_value(val, undefined):
             return val
     if mt_settings.ENABLE_FALLBACKS and self.fallback_value is not NONE:
         return self.fallback_value
     else:
         if default is NONE:
             default = self.field.get_default()
         # Some fields like FileField behave strange, as their get_default() doesn't return
         # instance of attr_class, but rather None or ''.
         # Normally this case is handled in the descriptor, but since we have overridden it, we
         # must mock it up.
         if (isinstance(self.field, fields.files.FileField) and
                 not isinstance(default, self.field.attr_class)):
             return self.field.attr_class(instance, self.field, default)
         return default
 def __get__(self, instance, owner):
     if instance is None:
         return self
     langs = resolution_order(get_language(), self.fallback_languages)
     for lang in langs:
         loc_field_name = build_localized_fieldname(self.field_name, lang)
         # Localized field name with '_id'
         loc_attname = instance._meta.get_field(loc_field_name).get_attname()
         val = getattr(instance, loc_attname, None)
         if val is not None:
             return val
     return None
Beispiel #4
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def append_fallback(model, fields):
    """
    If translated field is encountered, add also all its fallback fields.
    Returns tuple: (set_of_new_fields_to_use, set_of_translated_field_names)
    """
    fields = set(fields)
    trans = set()
    from wagtail_modeltranslation.translator import translator
    opts = translator.get_options_for_model(model)
    for key, _ in opts.fields.items():
        if key in fields:
            langs = resolution_order(get_language(), getattr(model, key).fallback_languages)
            fields = fields.union(build_localized_fieldname(key, lang) for lang in langs)
            fields.remove(key)
            trans.add(key)
    return fields, trans