The following demonstrates a python3 sqlalchemy bug where an association
proxy does not allow assignment in place without specifying the start
index. It gives a "TypeError: list indices must be integers, not NoneType"
error. It fails on sqlalchemy 0.9.3, but python2 seems to have no problem.
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import *
from sqlalchemy.ext.associationproxy import association_proxy
Base = declarative_base()
def build(value):
return Table1(name=value)
class Table1(Base):
__tablename__ = 'table1'
id = Column(Integer, primary_key=True)
name = Column(String(100))
fk = Column(Integer, ForeignKey('table2.id'))
class Table2(Base):
__tablename__ = 'table2'
id = Column(Integer, primary_key=True)
t1s = relationship('Table1')
t1s_proxy = association_proxy('t1s', 'name', creator=build)
t2 = Table2()
t2.t1s.append(Table1(name='test'))
# fails
t2.t1s_proxy[:] = ['test']
# works
t2.t1s_proxy[0:] = ['test']
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