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-rw-r--r--registry.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/registry.py b/registry.py
index cebed8e..64f59e4 100644
--- a/registry.py
+++ b/registry.py
@@ -218,7 +218,8 @@ class Registry(dict):
assert not '__abstract__' in obj.__dict__
assert obj.__select__
oid = oid or obj.__regid__
- assert oid
+ assert oid, ('no explicit name supplied to register object %s, '
+ 'which has no __regid__ set' % obj)
if clear:
objects = self[oid] = []
else: