Hi,
I want to define the relationship for my users and their groups with
declarative style (so that the relating model can inherit Timestamp
mixin and Tablename mixin):
class User(DeclarativeBase, Tablename, TimestampMixin):
'''User avatar is named after its id.
A user may be a student or teacher or both.
'''
id = Column(Integer, Sequence('user_id_seq'), primary_key=True)
username = Column(String(30), index=True, nullable=False, unique=True)
password = Column(String(30), index=True, nullable=False)
class Group(DeclarativeBase, Tablename, TimestampMixin):
id = Column(Integer, Sequence('group_id_seq'), primary_key=True)
name = Column(Unicode(20), unique=True, nullable=False)
display = Column(Unicode(255))
class GroupUser(DeclarativeBase, Tablename, TimestampMixin):
id = Column(Integer, Sequence('group_user_id_seq'), primary_key=True)
user = Column(Integer, ForeignKey('user.id'), index=True),
group = Column(Integer, ForeignKey('group.id'), index=True)
I was wondering how to associate User and Group with GroupUser with
GroupUser as the association object/proxy? The sqlalchemy docs only
mention only mention association tables, or non-declarative manual mapping.
Thanks.
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