1 add_relation_type('prefered_form')

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

     2 

     3 rql('SET X prefered_form Y WHERE Y canonical TRUE, X identical_to Y')

     4 commit()

     5 

     6 drop_attribute('EmailAddress', 'canonical')

     7 drop_relation_definition('EmailAddress', 'identical_to', 'EmailAddress')

     8 

     9 if 'see_also' in schema:

    10     sync_schema_props_perms('see_also', syncprops=False, syncrdefs=False)