python - Django Rest框架中嵌套序列化器的过滤查询集

Question

这是我的观点:

class SectorListAPI(generics.ListAPIView):
    queryset = SectorModel.objects.all()
    serializer_class = SectorSerializer

这是我的序列化器:

class OrganizationSerializer(serializers.ModelSerializer):
class Meta:
    model = GroupProfile
    fields = ('title','slug',)



class DepartmentSerializer(serializers.ModelSerializer):
    organizations = OrganizationSerializer(many=True, read_only=True)
    class Meta:
        model = DepartmentModel
        fields = ('title', 'organizations',)


class SectorSerializer(serializers.ModelSerializer):
    # title = serializers.CharField()
    departments = DepartmentSerializer(many=True, read_only=True)

    class Meta:
        model = SectorModel
        fields = ('title','departments',)

看，这里'SectorSerializer'是父级，'DepartmentSerializer'是子级，'OrganizationSerializer'是孙级序列化器。现在，在我看来，我可以轻松地过滤“SectorModel”的查询集。但是我如何过滤“GroupProfile”模型。

Answer 1

您可能想要过滤查询集，以确保仅返回与当前经过身份验证的发出请求的用户相关的结果。

您可以通过根据 request.user 的值进行过滤来实现此目的。

例如:

from myapp.models import Purchase
from myapp.serializers import PurchaseSerializer
from rest_framework import generics

class PurchaseList(generics.ListAPIView):
    serializer_class = PurchaseSerializer

    def get_queryset(self):
        """
        This view should return a list of all the purchases
        for the currently authenticated user.
        """
        user = self.request.user
        return Purchase.objects.filter(purchaser=user)

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编辑

您可以对 ListSerializer 进行子类化并覆盖 to_representation 方法。

默认情况下，to_representation 方法在嵌套查询集上调用 data.all()。因此，您实际上需要在调用该方法之前创建 data = data.filter(**your_filters) 。然后，您需要将子类 ListSerializer 添加为嵌套序列化器元上的 list_serializer_class。

1-子类ListSerializer，覆盖to_representation然后调用super

2- 将子类 ListSerializer 添加为嵌套序列化器上的元 list_serializer_class。

与您相关的代码:

class FilteredListSerializer(serializers.ListSerializer):

def to_representation(self, data):
    data = data.filter(user=self.request.user, edition__hide=False)
    return super(FilteredListSerializer, self).to_representation(data)


class OrganizationSerializer(serializers.ModelSerializer):
class Meta:
    list_serializer_class = FilteredListSerializer
    model = GroupProfile
    fields = ('title','slug',)



class DepartmentSerializer(serializers.ModelSerializer):
    organizations = OrganizationSerializer(many=True, read_only=True)
    class Meta:
        model = DepartmentModel
        fields = ('title', 'organizations',)


class SectorSerializer(serializers.ModelSerializer):
    # title = serializers.CharField()
    departments = DepartmentSerializer(many=True, read_only=True)

    class Meta:
    model = SectorModel
    fields = ('title','departments',)