Hi,
it seems there has been a bug introduced
in http://hg.sqlalchemy.org/sqlalchemy/rev/4e9c059abca3 when using both
column_mapped_collections and joined table inheritance.
Due to the fact that::
cols = [c.key for c in [
expression._only_column_elements(q, "mapping_spec")
for q in util.to_list(mapping_spec)]]
removes all table information from the column data,
`_SerializableColumnGetter` fails in the `__call__` method as
`self.colkeys` does not contain the names which `m.mapped_table.columns[k]`
expects.
Cheers
/rike
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