Fix failing tox

Author: Anton-Shutik

rest_framework_json_api/relations.py

@@ -118,9 +118,11 @@ def get_links(self, obj=None, lookup_field='pk'):
 
         """
         Assuming RelatedField will be declared in two ways:
-        1. url(r'^authors/(?P<pk>[^/.]+)/(?P<related_field>\w+)/$', AuthorViewSet.as_view({'get': 'retrieve_related'}))
-        2. url(r'^authors/(?P<author_pk>[^/.]+)/bio/$', AuthorBioViewSet.as_view({'get': 'retrieve'}))
-        In other words if related_link_url_kwarg == 'pk' it will add 'related_field' parameter to reverse()
+        1. url(r'^authors/(?P<pk>[^/.]+)/(?P<related_field>\w+)/$',
+                AuthorViewSet.as_view({'get': 'retrieve_related'}))
+        2. url(r'^authors/(?P<author_pk>[^/.]+)/bio/$',
+                AuthorBioViewSet.as_view({'get': 'retrieve'}))
+        So, if related_link_url_kwarg == 'pk' it will add 'related_field' parameter to reverse()
         """
         if self.related_link_url_kwarg == 'pk':
             related_kwargs = self_kwargs

rest_framework_json_api/views.py

@@ -133,8 +133,10 @@ def get_serializer_class(self):
         if 'related_field' in self.kwargs:
             field_name = self.kwargs['related_field']
 
-            assert hasattr(parent_serializer_class, 'included_serializers') or self.related_serializers,\
-                'Either "included_serializers" or "related_serializers" should be configured'
+            assert hasattr(parent_serializer_class, 'included_serializers') \
+                   or self.related_serializers,\
+                'Either "included_serializers" or ' \
+                '"related_serializers" should be configured'
 
             # Try get the class from related_serializers
             class_str = self.related_serializers.get(field_name, None)