primary_key argument to mapper is a list
primary_key=[my_column, my_other_column, ..]
clearly this is a bug: http://www.sqlalchemy.org/docs/orm/mapper_config.html#,
ill change that now
I'll see if I can add a scalar-list adapter in 0.7 for that arg
On Nov 16, 2010, at 4:53 PM, Royce wrote:
Using version 0.6.5 under python 2.6.5 even simple augments to
__mapper_args__ variable course errors
E.g.
from sqlalchemy import *
from sqlalchemy.dialects.mysql import *
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class CourseAliases(Base):
__tablename__ = 'CourseAliases'
alias= Column(CHAR(length=7), nullable=False)
year = Column(INTEGER())
course_stream_id = Column(INTEGER(), nullable=False)
auto_gen = Column(CHAR(length=1), nullable=False)
__mapper_args__ = {
'primary_key': course_stream_id
}
If I try to import it the resultant errors are
from tables import CourseAliases2
Traceback (most recent call last):
File stdin, line 1, in module
File tables/CourseAliases2.py, line 7, in module
class CourseAliases(Base):
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/ext/declarative.py, line 1231, in __init__
_as_declarative(cls, classname, cls.__dict__)
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/ext/declarative.py, line 1224, in
_as_declarative
**mapper_args)
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/orm/__init__.py, line 861, in mapper
return Mapper(class_, local_table, *args, **params)
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/orm/mapper.py, line 217, in __init__
self._configure_pks()
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/orm/mapper.py, line 481, in _configure_pks
if self.primary_key_argument:
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/sql/expression.py, line 1423, in __nonzero__
raise TypeError(Boolean value of this clause is not defined)
TypeError: Boolean value of this clause is not defined
I know I can add the primary_key=True to a Column but what I actually
wanted to do is make a multiple column primary key
E.g
__mapper_args__ = {
'primary_key': [course_stream_id,alias]
}
this produces a different error.
Traceback (most recent call last):
File stdin, line 1, in module
File tables/CourseAliases2.py, line 7, in module
class CourseAliases(Base):
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/ext/declarative.py, line 1231, in __init__
_as_declarative(cls, classname, cls.__dict__)
File /usr/pkg/lib/python2.6/site-packages/SQLAlchemy-0.6.5-
py2.6.egg/sqlalchemy/ext/declarative.py, line 1048, in
_as_declarative
mapper_args[k] = column_copies.get(v,v)
TypeError: Error when calling the metaclass bases
unhashable type: 'list'
What am I doing wrong ? I am fairly sure I am only doing what the
documentation says.
Thanks for any help
Royce
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