> relationship() expects a class or a mapper instance, not a string. I
> got this error:
>
> ArgumentError: relationship 'available_deals' expects a class or a
> mapper argument (received: <type 'str'>)
Hmm... I'm not sure what I'm doing wrong but passing strings to
relation() definitely works for me:
class Host(Base):
__tablename__ = 'hosts'
id = sa.Column(sa.Integer, primary_key = True)
...
datacentre_id = sa.Column(sa.Integer,
sa.ForeignKey('datacentres.id'))
datacentre = sa.orm.relation('Datacentre', backref='hosts')
Can it be because I'm using declarative? In my case I don't even need
to import Datacentre class before I declare Host class.
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