Mixin drops column uniqueness (because Column.copy omits it)

If I do this:

class MyMixin(object):
    id = Column(Integer, primary_key=True)
    value = Column(String, unique=True)

class MyModel(Base, MyMixin):
    __tablename__ = 'test'

then MyModel.__table__.c.value.unique is false — the column uniqueness specified by the mixin is silently dropped. This is because Column.copy omits that attribute.

Attaching patch that fixes this, with tests. Breaks no tests.

Comments (6)