old_contents: from __future__ import unicode_literals
  
  from django_filters.rest_framework import DjangoFilterBackend
  
  from waldur_core.core import views as core_views
  from waldur_core.structure import filters as structure_filters
  from waldur_core.structure import permissions as structure_permissions
  
  from . import serializers, models, filters
  
  
  class BaseMarketplaceView(core_views.ActionsViewSet):
      lookup_field = 'uuid'
      filter_backends = (DjangoFilterBackend,)
      update_permissions = \
          partial_update_permissions = \
          destroy_permissions = \
          [structure_permissions.is_owner]
  
  
  class ServiceProviderViewSet(BaseMarketplaceView):
      queryset = models.ServiceProvider.objects.all()
      serializer_class = serializers.ServiceProviderSerializer
      filter_class = filters.ServiceProviderFilter
  
  
  class CategoryViewSet(core_views.ActionsViewSet):
      queryset = models.Category.objects.all()
      serializer_class = serializers.CategorySerializer
      lookup_field = 'uuid'
      filter_backends = (DjangoFilterBackend,)
  
      create_permissions = \
          update_permissions = \
          partial_update_permissions = \
          destroy_permissions = \
          [structure_permissions.is_staff]
  
  
  class OfferingViewSet(BaseMarketplaceView):
      queryset = models.Offering.objects.all()
      serializer_class = serializers.OfferingSerializer
      lookup_field = 'uuid'
      filter_backends = (structure_filters.GenericRoleFilter, DjangoFilterBackend)
      filter_class = filters.OfferingFilter
  
  
  class ScreenshotViewSet(BaseMarketplaceView):
      queryset = models.Screenshots.objects.all()
      serializer_class = serializers.ScreenshotSerializer
      filter_class = filters.ScreenshotFilter
  
new_contents: from __future__ import unicode_literals
  
  from django_filters.rest_framework import DjangoFilterBackend
  
  from waldur_core.core import views as core_views
  from waldur_core.structure import permissions as structure_permissions
  
  from . import serializers, models, filters
  
  
  class BaseMarketplaceView(core_views.ActionsViewSet):
      lookup_field = 'uuid'
      filter_backends = (DjangoFilterBackend,)
      update_permissions = \
          partial_update_permissions = \
          destroy_permissions = \
          [structure_permissions.is_owner]
  
  
  class ServiceProviderViewSet(BaseMarketplaceView):
      queryset = models.ServiceProvider.objects.all()
      serializer_class = serializers.ServiceProviderSerializer
      filter_class = filters.ServiceProviderFilter
  
  
  class CategoryViewSet(core_views.ActionsViewSet):
      queryset = models.Category.objects.all()
      serializer_class = serializers.CategorySerializer
      lookup_field = 'uuid'
      filter_backends = (DjangoFilterBackend,)
  
      create_permissions = \
          update_permissions = \
          partial_update_permissions = \
          destroy_permissions = \
          [structure_permissions.is_staff]
  
  
  class OfferingViewSet(BaseMarketplaceView):
      queryset = models.Offering.objects.all()
      serializer_class = serializers.OfferingSerializer
      filter_class = filters.OfferingFilter
  
  
  class ScreenshotViewSet(BaseMarketplaceView):
      queryset = models.Screenshots.objects.all()
      serializer_class = serializers.ScreenshotSerializer
      filter_class = filters.ScreenshotFilter
  
subject: Fix unit tests [WAL-1670]