39 class MyMixin(object):
 40     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
 41     created = db.Column(db.DateTime())
 42     modified = db.Column(db.DateTime())
 43
 44
 45 class Category(db.Model, MyMixin):
 46     __table__ = 'categories'
 47     name = db.Column(db.String(50), nullable=False)
 48     featured = db.Column(db.Boolean)
 49     metadescription = db.Column(db.Text)
 50     metakeywords = db.Column(db.String(50))
 51     image = db.Column(db.Text(20))
 52     created = db.Column(db.DateTime)
 53     modified = db.Column(db.DateTime)
 54
 55     children = db.relationship('Category', backref='parent', remote_side='Category.id')
 56     parent = db.relationship('Category', remote_side='Category.id')
 57
 58
 59     def __init__(self, name, parent=None):
 60         self.name = name
 61         self.parent = parent
 62
 63     def append(self, nodename):
 64         self.children[nodename] = Category(nodename, parent=self)
 65
 66     def __repr__(self):
 67         return "Category(name=%r, id=%r, parent_id=%r)" % (
 68             self.name,
 69             self.id,
 70             self.parent_id
 71         )



Traceback (most recent call last):
  File "models.py", line 45, in <module>
    class Category(db.Model, MyMixin):
  File "/home/rawl/misbids/env/lib/python2.7/site-packages/Flask_SQLAlchemy-0.15-py2.7.egg/flaskext/sqlalchemy.py", line 467, in __init__
    DeclarativeMeta.__init__(self, name, bases, d)
  File "build/bdist.linux-i686/egg/sqlalchemy/ext/declarative.py", line 1273, in __init__
  File "build/bdist.linux-i686/egg/sqlalchemy/ext/declarative.py", line 1063, in _as_declarative
AttributeError: 'str' object has no attribute 'c'