Hey,
I'm trying to use reflection with SQLAlchemy 0.8 but I always get this
exception:
sqlalchemy.exc.ArgumentError: Mapper Mapper|links|links could not assemble any
primary key columns for mapped table 'links'
mysql> show fields from links;
+--------+-----------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+-----------------+------+-----+---------+-------+
| l_from | int(8) unsigned | NO | PRI | 0 | |
| l_to | int(8) unsigned | NO | PRI | 0 | |
+--------+-----------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
The class definition is pretty simple:
class links(Base):
__table__ = Table('links', Base.metadata, autoload=True)
Traceback:
File "…/main.py", line 36, in connect_to_db
class links(Base):
File "…/sqlalchemy/ext/declarative.py", line 1343, in __init__
_as_declarative(cls, classname, cls.__dict__)
File "…/sqlalchemy/ext/declarative.py", line 1336, in _as_declarative
**mapper_args)
File "…/sqlalchemy/orm/__init__.py", line 1129, in mapper
return Mapper(class_, local_table, *args, **params)
File "…/sqlalchemy/orm/mapper.py", line 203, in __init__
self._configure_pks()
File "…/sqlalchemy/orm/mapper.py", line 773, in _configure_pks
(self, self.mapped_table.description))
Any idea why this happens and how I fix the problem? (without having to
specify the ORM mapping myself)
fs
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