Django nonrel Query confusion

Question

Я создаю практику django-nonrel, размещенную на Google AppEngine, чтобы получить некоторое знакомство с Django и платформой AppEngine, но я столкнулся с проблемой недоумения запросов. Вот мой models.py:

class Character(models.Model): 
     name = models.CharField(max_length=200) 
     url_name = models.CharField(max_length=200) 

     def save(self, *args, **kwargs): 
      self.url_name = self.name.replace(" ", "-").lower() 
      super(Character, self).save(*args, **kwargs) # Call the "real" save() method. 


    def __unicode__(self): 
     return '%s' %(self.name) 

class Season(models.Model): 
    season_number = models.IntegerField() 

    def __unicode__(self): 
     return u'Season %d' % (self.season_number) 

class Episode(models.Model): 
    season = models.ForeignKey(Season) 
    episode_name = models.CharField(max_length=200) 
    episode_number= models.IntegerField() 

    def __unicode__(self): 
     return u'Season %d, Episode %d "%s"' %(self.season.season_number, self.episode_number, self.episode_name) 

class Quote(models.Model): 
    author = models.ForeignKey(Character) 
    episode = models.ForeignKey(Episode) 
    quote_text = models.TextField() 

    def __unicode__(self): 
     return u'"%s" (%s)' % (self.quote_text, self.episode) 

Теперь вот где путаница:. Почему Quote.objects.all() order_by ('эпизод') работы, в то время как Quote.objects.filter (author__name = "Майкл Скотт") .order_by ('episode') не работает? Как видно из последнего фильтра, проблема связана не с вызовом author__name, поскольку этот индекс был зарегистрирован с помощью dbindexer. Проблема заключается в части order_by ('episode'), , но я не понимаю, почему это работает на одном QuerySet, но не на другом.

>>> from QuotesCMS.models import Character, Season, Episode, Quote 
>>> Quote.objects.all().order_by('episode') 
[<Quote: "My proudest moment here wasn't when I increased profits by 17 percent, or cut expenditure without losing a single member of staff. No no no. It was a young Guatemalan guy, first job in the country, barely spoke a word of English, but he came to me and said, 'Mr. Scott, will you be the godf 
ather to my child?' Wow... wow. Didn't work out in the end. We had to let him go. He sucked." (Season 1, Episode 1 "Pilot")>, <Quote: " Abraham Lincoln once said, 'If you are a racist, I will attack you with the North,' and those are the principles I carry with me into the workplace." (Season 1, Epi 
sode 2 "Diversity Day")>, <Quote: "I love inside jokes... I'd love to be a part of one someday." (Season 3, Episode 2 "The Convention")>, <Quote: "I declare...bankruptcy!!!" (Season 4, Episode 4 "Money")>, <Quote: "When I'm at home at night in my own house in my sweats, drinking red wine, watching m 
y mystery stories the last thing in the whole godforsaken world I want to hear is the voice of Michael Scott." (Season 4, Episode 4 "Money")>, <Quote: "As of this morning, we are completely wireless here on Schrute Farms. So as soon as I find out where Mose hid all the wires, we can have power back 
on. " (Season 4, Episode 4 "Money")>, <Quote: "I just realized that this is Pam's and my first night away together. I used to play it over in my head, and it was just a little bit different. Maybe a nice hotel, or a romantic dinner, wine, but wine that wasn't made out of beets. Didn't think Dwight w 
ould be involved at all. And I always imagined less manure. I mean, some manure, just less." (Season 4, Episode 4 "Money")>] 

-

>>> Quote.objects.filter(author__name="Michael Scott").order_by('episode') 
Traceback (most recent call last): 
    File "<console>", line 1, in <module> 
    File "C:\OfficeQuotes\django\db\models\query.py", line 93, in __repr__ 
    data = list(self[:REPR_OUTPUT_SIZE + 1]) 
    File "C:\OfficeQuotes\django\db\models\query.py", line 108, in __len__ 
    self._result_cache.extend(self._iter) 
    File "C:\OfficeQuotes\django\db\models\query.py", line 317, in iterator 
    for row in compiler.results_iter(): 
    File "C:\OfficeQuotes\djangotoolbox\db\basecompiler.py", line 411, in results_iter 
    for entity in results: 
    File "C:\OfficeQuotes\djangoappengine\db\compiler.py", line 138, in fetch 
    for entity in results: 
    File "C:\Program Files (x86)\Google\google_appengine\google\appengine\datastore\datastore_query.py", line 3317, in next 
    next_batch = self.__batcher.next_batch(Batcher.AT_LEAST_OFFSET) 
    File "C:\Program Files (x86)\Google\google_appengine\google\appengine\datastore\datastore_query.py", line 3203, in next_batch 
    batch = self.__next_batch.get_result() 
    File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 613, in get_result 
    return self.__get_result_hook(self) 
    File "C:\Program Files (x86)\Google\google_appengine\google\appengine\datastore\datastore_query.py", line 2917, in __query_result_hook 
    yaml_index=yaml, xml_index=xml) 
NeedIndexError: no matching index found. 
The suggested index for this query is: 
- kind: QuotesCMS_quote 
    properties: 
    - name: author_id 
    - name: episode_id 

-

>>> Quote.objects.filter(author__name="Michael Scott") 
    [<Quote: "I declare...bankruptcy!!!" (Season 4, Episode 4 "Money")>, <Quote: " Abraham Lincoln once said, 'If you are a racist, I will attack you with the North,' and those are the principles I carry with me into the workplace." (Season 1, Episode 2 "Diversity Day")>, <Quote: "My proudest moment her 
    e wasn't when I increased profits by 17 percent, or cut expenditure without losing a single member of staff. No no no. It was a young Guatemalan guy, first job in the country, barely spoke a word of English, but he came to me and said, 'Mr. Scott, will you be the godfather to my child?' Wow... wow. 
    Didn't work out in the end. We had to let him go. He sucked." (Season 1, Episode 1 "Pilot")>, <Quote: "I love inside jokes... I'd love to be a part of one someday." (Season 3, Episode 2 "The Convention")>] 

Надежда котировки немного развлекательным, и заранее спасибо за любую помощь.

Answer 1

Вам необходимо управлять и обновлять индексы для запросов вашего приложения.

Проверьте (не менее) раздел Index configurationDatastore Indexes.

Сообщение об ошибке, которое вы получили, также содержит информацию об индексе, который вам, вероятно, понадобится для конкретного выполненного вами запроса.

Также обратите внимание, что конфигурация индекса не вступает в силу немедленно после загрузки, это может занять некоторое время, чтобы создать новые добавленные индексы. Я видел только задержки максимум несколько минут, но моя БД также довольно мала. YMMV.