Question

我想在django orm中进行以下查询，我尝试使用queryset示例，但是它不起作用，总是返回错误，我想知道是否有可能解决此问题。我认为问题的根源是GROUP BY，而Django ORM并没有执行GROUP BY，但这只是一个猜测。

错误：

Traceback (most recent call last):
  File "C:\Python35\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "C:\Python35\lib\site-packages\django\core\handlers\base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Python35\lib\site-packages\django\core\handlers\base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Python35\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "C:\Python35\lib\site-packages\rest_framework\viewsets.py", line 116, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Python35\lib\site-packages\rest_framework\views.py", line 495, in dispatch
    response = self.handle_exception(exc)
  File "C:\Python35\lib\site-packages\rest_framework\views.py", line 455, in handle_exception
    self.raise_uncaught_exception(exc)
  File "C:\Python35\lib\site-packages\rest_framework\views.py", line 492, in dispatch
    response = handler(request, *args, **kwargs)
  File "C:\Python35\lib\site-packages\drf_multiple_model\mixins.py", line 112, in list
    data = query_data['serializer_class'](queryset, many=True, context=context).data
  File "C:\Python35\lib\site-packages\rest_framework\serializers.py", line 765, in data
    ret = super(ListSerializer, self).data
  File "C:\Python35\lib\site-packages\rest_framework\serializers.py", line 262, in data
    self._data = self.to_representation(self.instance)
  File "C:\Python35\lib\site-packages\rest_framework\serializers.py", line 683, in to_representation
    self.child.to_representation(item) for item in iterable
  File "C:\Python35\lib\site-packages\django\db\models\query.py", line 268, in __iter__
    self._fetch_all()
  File "C:\Python35\lib\site-packages\django\db\models\query.py", line 1186, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "C:\Python35\lib\site-packages\django\db\models\query.py", line 106, in __iter__
    for row in compiler.results_iter(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size):
  File "C:\Python35\lib\site-packages\django\db\models\sql\compiler.py", line 1017, in results_iter
    results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch, chunk_size=chunk_size)
  File "C:\Python35\lib\site-packages\django\db\models\sql\compiler.py", line 1052, in execute_sql
    sql, params = self.as_sql()
  File "C:\Python35\lib\site-packages\django\db\models\sql\compiler.py", line 449, in as_sql
    extra_select, order_by, group_by = self.pre_sql_setup()
  File "C:\Python35\lib\site-packages\django\db\models\sql\compiler.py", line 55, in pre_sql_setup
    group_by = self.get_group_by(self.select + extra_select, order_by)
  File "C:\Python35\lib\site-packages\django\db\models\sql\compiler.py", line 130, in get_group_by
    if (sql, tuple(params)) not in seen:
TypeError: unhashable type: 'list'

Postgres查询：

SELECT (Count(jsonb(conversa->'parse_data'->'intent'->'name'))) as quantidade,
       jsonb(conversa->'parse_data'->'intent'->'name') as intent,
       to_char(data,'Mon') as mon
FROM conversas
where conversa->'text' is not null and conversa->'parse_data' is not null
group by intent, mon

Django ORM：

存储库：

queryset =  Conversas.objects.extra(select={'mon':"to_char(data,'Mon')"}
                            ).filter(conversa__text__isnull=False,
                                     conversa__parse_data__isnull=False,
                                     data__gte=last_day,
                                     data__lte=today
                            ).annotate(intent=KeyTransform('name',
                                                    KeyTransform('intent',
                                                    KeyTransform('parse_data','conversa'))),
                                        quantidade=Count(Jsonb(KeyTransform('name',
                                                               KeyTransform('intent',
                                                               KeyTransform('parse_data','conversa')))))
                            ).values('mon', 'intent','quantidade'
                            ).order_by('mon','intent')

Jsonb类：

class Jsonb(Func):
    function = 'jsonb'
    template = '%(function)s(%(expressions)s)'
    arity = 1

Postgres查询到Django ORM

0 个答案: