When I went looking for docs to remind myself how to build a many-to-many
relationship, the first doc I found at
http://www.sqlalchemy.org/docs/orm/extensions/declarative.html
keywords = Table(
'keywords', Base.metadata,
Column('author_id', Integer, ForeignKey('authors.id')),
Column('keyword_id', Integer, ForeignKey('keywords.id'))
)
class Author(Base):
__tablename__ = 'authors'
id = Column(Integer, primary_key=True)
keywords = relationship("Keyword", secondary=keywords)
... confused me completely, because I couldn't tell whether ``keywords`` was
the association table? (Which seemed to be implied by
``secondary=keywords``). And ``keywords`` has a foreign key
(``keyword_id``) which points to ``keywords.id``, a column that... doesn't
exist? Trying to run it threw ``sqlalchemy.exc.NoReferencedColumnError:
Could not create ForeignKey 'keywords.id' on table 'keywords': table
'keywords' has no column named 'id'``
Anyway, I suggest that it would be much less confusing to just refer to the
ORM tutorial example, "Building a Many To Many Relationship" at
http://www.sqlalchemy.org/docs/orm/tutorial.html, which I think is much more
clear but which unfortunately only shows up at position #14 in the search
results of a "many-to-many" search.
Thanks!
--
- Catherine
http://catherinedevlin.blogspot.com
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