Hi,
I have a problem with cascading a delete. I have two tables, and they
are mapped many-to-many:
class File(object): pass
file_table = Table('file', metadata,
Column('id', Integer, primary_key=True, autoincrement=True),
Column('filename', String(255)),
}
class FileHost(object): pass
file_host = Table('host', metadata,
Column('id', Integer, primary_key=True, autoincrement=True ),
Column('name', String(255)),
)
file_hosted = Table('file_hosted', metadata,
Column('id_host', Integer, ForeignKey('host.id')),
Column('id_file', Integer, ForeignKey('file.id'))
)
session.mapper(File, file_table, properties={
'host': relation(FileHost, secondary=file_hosted, backref='files',
cascade='all,delete-orphan', single_parent=True)
})
session.mapper(FileHost, file_host)
This is the error I get:
sqlalchemy.exc.IntegrityError: (IntegrityError) update or delete on
table "file" violates foreign key constraint
"file_hosted_id_file_fkey" on table "file_hosted"
DETAIL: Key (id)=(50905) is still referenced from table
"file_hosted".
Can somebody please tell me what I'm doing wrong because I tried to
find an answer and couldn't. This was the only somewhat related thing
I found: http://www.mail-archive.com/[email protected]/msg13198.html
--tom
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