I'm trying to do something that seems (to me at least) to be very
simple: I have two classes, 'Project' and 'Image'. I want to
associate a set of 'Image's with a project, like a slide show or
whatever. I also want to use *one* of those images as a thumbnail for
the project. Here's my relevant code:
class Project(DeclarativeBase):
__tablename__='project'
images = relation( Image, backref=backref('project'),
primaryjoin=id==Image.project_id, order_by=Image.sequencePosition )
thumbnail_id = Column(Integer, ForeignKey('image.id') )
thumbnail = relation(Image, primaryjoin=thumbnail_id==Image.id,
uselist=False)
class Image(DeclarativeBase):
__tablename__='image'
project_id = Column(Integer, ForeignKey('project.id'))
I've tried about 20 different ways to define these two types of
relationships, and every one of them ends up giving me circular
dependancy errors.
Can someone help me understand what's going wrong?
Thanks
-Ryan
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