On Jan 5, 2012, at 9:57 AM, Michael Hipp wrote:
> Working from the many-many example in the tutorial [1], it has an association
> table like this:
>
> post_keywords = Table('post_keywords', Base.metadata,
> Column('post_id', Integer, ForeignKey('posts.id')),
> Column('keyword_id', Integer, ForeignKey('keywords.id'))
> )
>
> Normally to just empty everything from a table I'd do this:
>
> session.query(BlogPost).delete()
if you use ON DELETE CASCADE on the foreign keys referred to by post_keywords,
then those rows will delete automatically when saying query(BlogPost).delete().
if you don't have ON DELETE CASCADE set up, then you'd need to delete each
BlogPost individually:
for post in query(BlogPost):
session.delete(post)
or otherwise remove the associations to each keyword.
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