Hi,
On 01/03/2013 15:59, Werner wrote:
Hi,
Found it in the doc, the "Adjacency List Relationship" is what I wanted.
http://docs.sqlalchemy.org/en/latest/orm/relationships.html#adjacency-list-relationships
I am having a problem when I try to delete an item where I use this, I
get this exception:
sqlalchemy.exc.ProgrammingError: (ProgrammingError) (-530,
'isc_dsql_execute: \n violation of FOREIGN KEY constraint
"WINERACKU_FK_COMBRACK_ID" on table "WINERACKU"\n Foreign key
references are pres ... (truncated)
File "c:\dev\twcbv4\twcbsrc\controllers\dwinerack.py", line 268, in <module>
dlg.ShowModal()
File "c:\Python27\Lib\site-packages\wx-2.9.5-msw\wx\_windows.py", line
805, in ShowModal
return _windows_.Dialog_ShowModal(*args, **kwargs)
File "c:\dev\twcbv4\twcbsrc\controllers\fwinerackdesign.py", line 391,
in deleteUnit
self.doListItemDelete(runit)
File "c:\dev\twcbv4\twcbsrc\controllers\base.py", line 1437, in
doListItemDelete
self._controller.ds.commit()
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\session.py",
line 719, in commit
self.transaction.commit()
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\session.py",
line 352, in commit
self._prepare_impl()
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\session.py",
line 332, in _prepare_impl
self.session.flush()
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\session.py",
line 1814, in flush
self._flush(objects)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\session.py",
line 1896, in _flush
flush_context.execute()
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\unitofwork.py",
line 372, in execute
rec.execute(self)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\unitofwork.py",
line 553, in execute
uow
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\persistence.py",
line 115, in delete_obj
cached_connections, mapper, table, delete)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\orm\persistence.py",
line 677, in _emit_delete_statements
connection.execute(statement, del_objects)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\engine\base.py",
line 664, in execute
params)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\engine\base.py",
line 764, in _execute_clauseelement
compiled_sql, distilled_params
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\engine\base.py",
line 878, in _execute_context
context)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\engine\base.py",
line 871, in _execute_context
context)
File
"c:\Python27\Lib\site-packages\sqlalchemy-0.8.0-py2.7.egg\sqlalchemy\dialects\firebird\base.py",
line 724, in do_execute
cursor.execute(statement, parameters or [])
Do I have to manually clear out the foreign keys first or can I fix it
by correctly setting things in the model?
I currently have:
StandardColumnMixin creates the "id" and date/user creation/update columns.
class Winerack(DeclarativeBase, mix.StandardColumnMixin):
__tablename__ = u'winerack'
name = sa.Column(sa.Unicode(length=30))
...
class Wineracku(DeclarativeBase, mix.StandardColumnMixin):
__tablename__ = u'wineracku'
description = sa.Column(sa.Unicode(length=30))
...
fk_winerack_id = sautils.reference_col('winerack')
fk_combrack_id = sa.Column(cts.KEYS, sa.ForeignKey('wineracku.id'))
Winerack.wineracku = sao.relationship('Wineracku', backref='winerack',
cascade="all, delete, delete-orphan")
Wineracku.winerackb = sao.relationship('Winerackb', backref='wineracku',
cascade="all, delete,
delete-orphan")
Wineracku.combrack = sao.relationship('Wineracku',
remote_side=[Wineracku.id],
cascade="all, delete, delete-orphan",
single_parent=True)
Werner
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