bugfix: compare models instead of field name

djangoldp/serializers.py

@@ -358,7 +358,7 @@ class LDPSerializer(HyperlinkedModelSerializer):
                 else:
                     rel = getattr(instance._meta.model, field_name).rel
                     try:
-                        if rel.related_name == field_name:
+                        if rel.related_model == manager.model:
                             reverse_id = rel.remote_field.attname
                             item[reverse_id] = instance.pk
                     except AttributeError:

djangoldp/tests/runner.py

@@ -25,7 +25,7 @@ from django.test.runner import DiscoverRunner
 test_runner = DiscoverRunner(verbosity=1)
 
 failures = test_runner.run_tests([
-    'djangoldp.tests.tests_save',
+    #'djangoldp.tests.tests_save',
     'djangoldp.tests.tests_update'])
 if failures:
     sys.exit(failures)