如何获取主键相关字段的所有值嵌套序列化程序django rest框架

from rest_framework import serializers

class MyModelSerializer(serializers.ModelSerializer):
    related_field = serializers.PrimaryKeyRelatedField(many=True, read_only=True)

    class Meta:
        model = MyModel
        fields = ('id', 'related_field', 'other_field')

from rest_framework import generics

class MyModelListView(generics.ListAPIView):
    serializer_class = MyModelSerializer

    def get_queryset(self):
        # 获取主键相关字段的所有值
        related_field_values = MyModel.objects.values_list('related_field', flat=True).distinct()
        return MyModel.objects.filter(related_field__in=related_field_values)

from django.urls import path
from .views import MyModelListView

urlpatterns = [
    path('mymodels/', MyModelListView.as_view(), name='mymodel-list'),
]