[ovs-dev] Problem with ovs python idl mutations

[Richard Theis]

As reported in [1], the ovs python idl mutations cause empty
column data to be returned by getattr after a mutation is
done the column. This can be recreated via the following
steps:

# Good column values
column_values = getattr(row, column, [])
# New value added via mutation
row.addvalue(column, new_value)
# Column values are empty
column_values = getattr(row, column, [])

The getattr() implementation for a Row is calling Datum
methods (e.g. extend, merge, etc.) which don't exist and
thus raise an exception:

"'Datum' object has no attribute 'merge'"

[1] https://bugs.launchpad.net/networking-ovn/+bug/1629099

Thanks,
Richard