Django Rest Framework(多对多字段上的 GET 过滤器)

Question

我想弄清楚如何按值过滤 ManyToMany 字段。在 Django 中，它就像 queryset.filter(m2mfield__name) 一样简单，但我无法弄清楚我错过了什么。我正在使用 Django Rest Framework ，以及 DjangoFilterBackend .

型号:

class City(models.Model):
    name = models.CharField(max_length=80)

class State(models.Model):
    name = models.CharField(max_length=50)
    cities = models.ManyToManyField(City)

过滤器:

import django_filters

class StateFilter(django_filters.FilterSet):
    cities = django_filters.CharFilter(
        name='cities__name',
        lookup_type='contains',
    )

    class Meta:
        model = State
        fields = ('name', 'cities')

序列化程序:

class CitySerializer(serializers.ModelSerializer):
    class Meta:
        model = City
        fields = ('name', )

class StateSerializer(serializers.ModelSerializer):
    cities = CitySerializer(many=True)

    class Meta:
        model = State
        fields = ('name', 'cities')
        filter_class = StateFilter

查看:

from rest_framework.generics import ListAPIView, RetrieveAPIView
from .serializers import StateSerializer

class StateList(ListAPIView):
    queryset = State.objects.all()
    serializer_class = StateSerializer
    filter_fields = ('name', 'cities')

../api/states/的输出当前为:

 [
     "name": "Florida",
     "cities": [
          "name": "Tampa",
          "name": "St. Petersburg",
          "name": "Orlando"
     ],
     "name": "North Carolina",
     "cities": [
          "name": "Raleigh",
          "name": "Charlotte",
          "name": "Greensboro"
     ]
 ]

如何通过 GET 调用按名称过滤城市，例如:

../api/states/?cities=Charlotte

上面的结果应该是:

 [
     "name": "North Carolina",
     "cities": [
          "name": "Raleigh",
          "name": "Charlotte",
          "name": "Greensboro"
     ]
 ]

Answer 1

好吧，我发现我做错了什么。它在 View 中。我没有在 View 上声明 filter_class:

from rest_framework.generics import ListAPIView, RetrieveAPIView
from .serializers import StateSerializer
from .filters import StateFilter

class StateList(ListAPIView):
    queryset = State.objects.all()
    serializer_class = StateSerializer
    filter_fields = ('name', 'cities')
    filter_class = StateFilter  # This was missing

我不小心把它放在了序列化器上。