code: def m2o_to_m2m(cr, model, table, field, source_field):
      
      return m2o_to_x2m(cr, model, table, field, source_field)
docs: Recreate relations in many2many fields that were formerly
      many2one fields. Use rename_columns in your pre-migrate
      script to retain the column's old value, then call m2o_to_m2m
      in your post-migrate script.
  
      :param model: The target model registry object
      :param table: The source table
      :param field: The field name of the target model
      :param source_field: the many2one column on the source table.
  
      .. versionadded:: 7.0
      .. deprecated:: 8.0
         Use :func:`m2o_to_x2m` instead.