[Sqlalchemy-tickets] Issue #3411: mixin column on declared_attr not getting set up for __table_args__, 1.0 (zzzeek/sqlalchemy)

[Mike B. <iss...@bi...>]

New issue 3411: mixin column on declared_attr not getting set up for __table_args__, 1.0
https://bitbucket.org/zzzeek/sqlalchemy/issue/3411/mixin-column-on-declared_attr-not-getting

Mike Bayer:


```
#!python

from sqlalchemy.ext.declarative import declarative_base, declared_attr
from sqlalchemy import Column, Integer, Unicode, UniqueConstraint

Base = declarative_base()


class Foo(object):

    foo = Column(Unicode(64), nullable=False)

    @declared_attr
    def bar(cls):
        return Column("bar", Integer)


class ItemCategory(Base, Foo):
    __tablename__ = 'item_category'

    id = Column(Integer, primary_key=True)
    name = Column(Unicode(64), nullable=False)

    __table_args__ = (
        UniqueConstraint(name, "foo", "bar",
                         name='unique_category_and_parent'),)
```