old_contents: import django_filters
  from django_filters.rest_framework import DjangoFilterBackend
  from api.models import Launcher, LauncherDetail, Orbiter
  
  from api.serializers import OrbiterSerializer, LauncherSerializer, LauncherDetailSerializer
  from rest_framework import viewsets
  from rest_framework import permissions
  
  
  class LauncherViewSet(viewsets.ModelViewSet):
      """
      API endpoint that allows Launcher to be viewed or edited.
      """
      queryset = Launcher.objects.all()
      serializer_class = LauncherSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
  
  
  class LauncherDetailViewSet(viewsets.ModelViewSet):
      """
      API endpoint that allows groups to be viewed or edited.
      """
      queryset = LauncherDetail.objects.all()
      serializer_class = LauncherDetailSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
      filter_backends = (django_filters.rest_framework.DjangoFilterBackend,)
      filter_fields = ('family', 'agency', 'name')
  
  
  class OrbiterViewSet(viewsets.ModelViewSet):
      """
      API endpoint that allows groups to be viewed or edited.
      """
      queryset = Orbiter.objects.all()
      serializer_class = OrbiterSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
new_contents: import django_filters
  from django_filters.rest_framework import DjangoFilterBackend
  from api.models import Launcher, LauncherDetail, Orbiter
  
  from api.serializers import OrbiterSerializer, LauncherSerializer, LauncherDetailSerializer
  from rest_framework import viewsets
  from rest_framework import permissions
  
  
  class LauncherViewSet(viewsets.ModelViewSet):
      """
      API endpoint that allows Launcher to be viewed or edited.
      """
      queryset = Launcher.objects.all()
      serializer_class = LauncherSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
  
  
  class LauncherDetailViewSet(viewsets.ModelViewSet):
      """
      API endpoint that allows groups to be viewed or edited.
      """
      queryset = LauncherDetail.objects.all()
      serializer_class = LauncherDetailSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
      filter_backends = (django_filters.rest_framework.DjangoFilterBackend,)
      filter_fields = ('family', 'agency', 'name', 'launch_agency__agency')
  
  
  class OrbiterViewSet(viewsets.ModelViewSet):
      """
      API endpoint that allows groups to be viewed or edited.
      """
      queryset = Orbiter.objects.all()
      serializer_class = OrbiterSerializer
      permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
subject: Add filter option.