Django nonrel查询混淆

Question

我正在创建一个在Google AppEngine上托管的练习django-nonrel项目，以便熟悉Django和AppEngine平台，但遇到了令人困惑的查询问题。这里是我的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) 

现在这里是哪里的困惑是：为什么Quote.objects.all（）ORDER_BY（ '插曲'）的工作，而Quote.objects.filter（author__name = “迈克尔·斯科特” ）.order_by（'episode'）不起作用？正如最后一个过滤器所证明的那样，问题不在author__name调用中，因为该索引已使用dbindexer注册。问题在于order_by（'episode'）部分，，但我不明白为什么这可以在一个QuerySet上工作，而不是另一个。

>>> 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")>] 

希望的报价是一个有点娱乐，并提前为任何帮助的感谢。

Answer 1

您需要管理和更新应用查询的索引。 （至少）Index configuration部分Datastore Indexes。

您收到的错误消息中还包含有关您执行的特定查询可能需要的索引信息。

另请注意，上传后索引配置不会立即生效，建立新添加的索引可能需要一段时间。我只看到最多几分钟的延迟，但我的DB也很小。因人而异。