Hi everyone, in my script I have to deal with a table whose number of columns can change at runtime. Since I have no information about the structure I will have to handle at a given moment, I would need to change dynamically the mapping during the program. If I try to re-map the table I obviously get the following error:
sqlalchemy.exc.ArgumentError: Class '<class 'MyMappingClassa'>' already has a primary mapper defined. Use non_primary=True to create a non primary Mapper. clear_mappers() will remove *all* current mappers from all classes. On the other hand clear_mappers removes all the mappers that has been defined on the classes; furthermore, as the documentation says: clear_mappers` is *not* for normal use, as there is literally no valid usage for it outside of very specific testing scenarios Can anyone give a hint to handle correctly this situation or point me out if there is a better approach to face it? Thanks in advance. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
