tyncseectb0
New Member
I am running into this sqlachemy error that I haven't been able to understand:\[code\] sqlalchemy.exc.InvalidRequestError: SQL expression, column, or mapped entity expected - got '<class '__main__.JobRecord'>'\[/code\]What does this error mean? What are possible causes?This is the method that triggers the error:\[code\]@classmethoddef find_job_record_from_pk(cls, pk): ''' return the job record with the given pk ''' job_record = MlcDb.get_session().query(cls).filter(cls.pk == pk).first() return job_record \[/code\]Mapping:\[code\]@classmethoddef define_mapping(cls): ''' SQLAlchemy mapping definition ''' cls.mapper = mapper(cls, cls.table, polymorphic_on = cls.table.c.item_type, properties = { 'item_type': synonym('_JobRecord__item_type', map_column=True), 'version': synonym('_JobRecord__version', map_column=True), 'state': synonym('_JobRecord__state', map_column=True), 'date_created' : synonym( '_JobRecord__date_created', map_column=True ) } )\[/code\]