######## BEGIN CODE SNIPPET
import sqlalchemy
from sqlalchemy import String, ForeignKey
from sqlalchemy.ext.activemapper import ActiveMapper, column, one_to_many
import sqlalchemy.ext.activemapper as activemapper
class A(ActiveMapper):
class mapping:
id = column(String, primary_key=True)
Bs = one_to_many('B', colname='a_id', backref='a')
class B(ActiveMapper):
class mapping:
a_id = column(String, foreign_key=ForeignKey('a.id'), primary_key=True)
c = column(String, nullable=False, primary_key=True)
activemapper.metadata.connect('sqlite:///:memory:')
activemapper.metadata.create_all()
a1 = A(id='foo')
b1 = B(a=a1, c='qux')
b2 = B(a=a1, c='quux')
B.get_by(a=a1)
######## END CODE SNIPPET
$ python2.4 sa-test.py
Traceback (most recent call last):
File "sa-test.py", line 25, in ?
B.get_by(a=a1)
File ".../lib/sqlalchemy/ext/assignmapper.py", line 7, in do
return getattr(query, name)(*args, **kwargs)
File ".../lib/sqlalchemy/orm/query.py", line 71, in get_by
x = self.select_whereclause(self.join_by(*args, **params), limit=1)
File ".../lib/sqlalchemy/orm/query.py", line 108, in join_by
c = (prop.columns[0]==value) & self.join_via(keys)
AttributeError: 'LazyLoader' object has no attribute 'columns'
...this running against SQLAlchemy trunk r1865.
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