I have a ContentObject class mapped using:
co_mapper = orm.mapper(ContentObject,
content_objects_table,
extension=COMapperExtension(),
polymorphic_on=content_objects_table.c.type,
polymorphic_identity='ContentObject',
properties={
'theme': orm.relation(Theme),
'resources': orm.relation(Resource,
secondary=co_resources_table),
'children': orm.relation(ContentObject,
secondary=co_children_table,
primaryjoin=content_objects_table.c.id==co_children_table.c.parent_id,
secondaryjoin=co_children_table.c.child_id==content_objects_table.c.id,
backref='parents'),
'translations': orm.relation(ContentObjectTranslation,
backref='co')
}
)
co = ContentObject()
co.children.append(Session.query(ContentObject).get(1))
# assert co not in Session # fails!
co.theme = Session.query(Theme).get(1) # Session flushes automatically
when retrieving a theme, and I get an error because the theme_id
column (with nullable=False) is not set yet
IntegrityError: (IntegrityError) content_objects.theme_id may not be
NULL u'INSERT INTO content_objects (type, parent_id, position,
theme_id, data, keywords) VALUES (?, ?, ?, ?, ?, ?)' ['group', None,
None, None, None, '']
If I remove backref='parents' it works as expected. Do I have to turn
auto-flush off to avoid incidental flushes?
Best regards,
Adam
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