I got it. It happens on models still in ir.model but not in the registry
because the python modules are not there.
I replaced the lines
attachment_pool.write(
cr, uid, attachment_ids, {'res_model': False},
context=context)
By
cr.execute(
"UPDATE ir_attachment SET res_model = FALSE "
"WHERE id IN %s",
(tuple(attachment_ids), ))
And it worked. Is it an acceptable solution?
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https://code.launchpad.net/~therp-nl/openupgrade-tools/7.0-add-database_cleanup/+merge/203633
Your team OpenUpgrade Committers is requested to review the proposed merge of
lp:~therp-nl/openupgrade-tools/7.0-add-database_cleanup into
lp:openupgrade-tools.
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