SQLAlchemy - order_by on relationship for join table

Question

I\'m using declarative SQLAlchemy and I have three models: Role, Permission, and RolePermission. In my Role model, I have t

Answer 1

The problem is in permissionLinks relationship. Ordering its items by by Role.name makes no sense to me.

Answer 2

I couldn't make any of these solutions work, however I found an easier way.

from sqlalchemy.ext.declarative import declarative_base

class User(Base):
    # ....
    addresses = relationship("Address",
                         order_by="desc(Address.email)",
                         primaryjoin="Address.user_id==User.id")

Found here: http://docs.sqlalchemy.org/en/latest/orm/extensions/declarative/relationships.html

Answer 3

What you want is to order the role attribute of the RolePermission object. Passing order_by sets the order in the Role class.

Try this:

from sqlalchemy.orm import backref

permissionLinks = relationship(RolePermission, backref=backref("role", order_by=name))

setting an order for the back reference