Python 过滤Django时保留带注释的秩
我有一个过滤查询集,其中我根据特定顺序注释了每个对象的排名 然后,当我执行其他过滤器时,如按秩更改顺序,保持不变。执行新的.filter()时会出现问题 我在页面上有一个搜索功能,可以在对象标题后过滤结果。但当我这样做时,注释的秩值会根据新查询中的结果数量而变化,而不是保留其原始值 举例说明: 这是我的原始查询:Python 过滤Django时保留带注释的秩,python,django,postgresql,window-functions,Python,Django,Postgresql,Window Functions,我有一个过滤查询集,其中我根据特定顺序注释了每个对象的排名 然后,当我执行其他过滤器时,如按秩更改顺序,保持不变。执行新的.filter()时会出现问题 我在页面上有一个搜索功能,可以在对象标题后过滤结果。但当我这样做时,注释的秩值会根据新查询中的结果数量而变化,而不是保留其原始值 举例说明: 这是我的原始查询: choices\u filter=Choice.objects.filter(锦标赛=pk).注释\ (rank=RawSQL(“rank()结束(按winrate DESC、pick
choices\u filter=Choice.objects.filter(锦标赛=pk).注释\
(rank=RawSQL(“rank()结束(按winrate DESC、pickrate DESC、播放次数排序)”,[]))
这将返回如下查询集:
Rank Title Winrate
1...........Apple...........55%
2...........Pear............47%
3...........Banana..........44%
4...........Orange..........35%
5...........Watermelon......31%
如果我执行.order_by('title'),我将得到以下预期结果:
Rank Title Winrate
1...........Apple...........55%
3...........Banana..........44%
4...........Orange..........35%
2...........Pear............47%
5...........Watermelon......31%
但如果我改为执行.filter(title_uicontains='an'),我会得到以下结果:
Rank Title Winrate
1...........Banana..........44%
2...........Orange..........35%
而不是期望的:
Rank Title Winrate
3...........Banana..........44%
4...........Orange..........35%
我对Django和python(以及数据库)还没有足够的经验,无法独自完成这项工作。我花了一段时间才弄明白如何注释排名,以及如何使用分页等
这是我的完整视图代码(如果相关)(我使用的是Django Rest框架和APIviews):
你可以使用图书馆
并遵循这一点
class GameDetailFilterView(APIView, PaginationHandlerMixin):
permission_classes = (AllowAny, )
pagination_class = FullPagination
serializer_class = ChoiceSerializer
def get(self, request, pk, *args, **kwargs):
choices_filter = Choice.objects.filter(tournament=pk).annotate \
(rank=RawSQL("RANK() OVER(ORDER BY winrate DESC, pickrate DESC, times_played)", []))
filter_condition = request.session['filter_condition']
if filter_condition is not None:
choices = choices_filter.filter(title__icontains=filter_condition)
else:
choices = choices_filter.order_by('rank')
page = self.paginate_queryset(choices)
if page is not None:
serializer = self.get_paginated_response(self.serializer_class(page,
many=True).data)
else:
serializer = self.serializer_class(choices, many=True)
return Response(serializer.data, status=status.HTTP_200_OK)
from django_cte import CTEManager, With
# models.py
class Choice(Model):
objects = CTEManager()
# ... other fields like tournament
# query
cte = With(
Choice.objects.filter(tournament=pk).annotate \
(rank=RawSQL("RANK() OVER(ORDER BY winrate DESC, pickrate DESC,times_played)", [])))
qs = cte.queryset().with_cte(cte).filter(title__icontains='an')