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better comment about overriding allow_inheritance

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This commit is contained in:
Stefan Wojcik 2016-12-08 11:15:35 -05:00
parent 0189818f3e
commit ae777e45b2
1 changed files with 8 additions and 4 deletions
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12
mongoengine/base/metaclasses.py
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@ -334,12 +334,16 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
meta.merge(attrs.get('_meta', {})) # Top level meta
# Only simple classes (direct subclasses of Document)
# may set allow_inheritance to False
# Only simple classes (i.e. direct subclasses of Document) may set
# allow_inheritance to False. If the base Document allows inheritance,
# none of its subclasses can override allow_inheritance to False.
simple_class = all([b._meta.get('abstract')
for b in flattened_bases if hasattr(b, '_meta')])
if (not simple_class and meta['allow_inheritance'] is False and
not meta['abstract']):
if (
not simple_class and
meta['allow_inheritance'] is False and
not meta['abstract']
):
raise ValueError('Only direct subclasses of Document may set '
'"allow_inheritance" to False')