1 # some entities have been added before schema entities, fix the 'is' and

     1 raise NotImplementedError("Cannot migrate such an old version. Use intermediate Cubiweb version (try 3.16.x)")

     2 # 'is_instance_of' relations

     3 for rtype in ('is', 'is_instance_of'):

     4     sql('INSERT INTO %s_relation '

     5         'SELECT X.eid, ET.cw_eid FROM entities as X, cw_CWEType as ET '

     6         'WHERE X.type=ET.cw_name AND NOT EXISTS('

     7         '      SELECT 1 from is_relation '

     8         '      WHERE eid_from=X.eid AND eid_to=ET.cw_eid)' % rtype)