The following simple code does not seem to produce the ALTER statement
expected for the Contact.ownername column.
When I look at the DB, there is no ForeignKeyConstraint on
Contact.ownername.
I think this results in problems later on: when I activate the
relationships, I cannot do
v=User(username="v")
session.add(v)
session.commit()
c2=Contact(contactname="c2",owner=v)
session.add(c2)
session.commit()
sqlalchemy.exc.IntegrityError: (IntegrityError) contact.ownername may
not be NULL u'INSERT INTO contact (contactname, ownername) VALUES
(?, ?)' ('c2', None)
which doesn't seem normal.
Here is the code:
from datetime import datetime
from sqlalchemy import (create_engine, MetaData, Table, Column,
Integer,
String, DateTime, Float, ForeignKey, and_, select)
from sqlalchemy.orm import mapper, relationship, create_session,
column_property,sessionmaker
from sqlalchemy.ext.associationproxy import AssociationProxy
from sqlalchemy.ext.declarative import declarative_base
engine = create_engine('sqlite://', echo=True)
#engine = create_engine('sqlite:///test.db', echo=True)
metadata = MetaData(engine)
Session = sessionmaker(bind=engine)
session=Session()
Base = declarative_base(bind=engine, metadata=metadata)
class User(Base):
__tablename__ = 'user'
username = Column(String(50), primary_key=True)
contactname = Column(String(50),
ForeignKey('contact.contactname'), nullable=True)
class Contact(Base):
__tablename__ = 'contact'
contactname = Column(String(50), primary_key=True)
ownername = Column(String(50), ForeignKey('user.username',
use_alter=True, name="fk_owner_constraint"), nullable=False)
# contacted_users = relationship("User", backref="contact",
post_update=True, primaryjoin=contactname==User.contactname)
# owner = relationship("User", backref="owned_contacts",
post_update=True, primaryjoin=User.username==ownername)
metadata.create_all(engine)
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