我正在使用：
SQLAlchemy==1.0.8
sqlalchemy-continuum===1.2.1
sqlalchemy-utils==0.31.0
后端是PG 9.3。对于Continuum来说，似乎多对多处理仍无法正常处理以下定义：
assoc_ver_shallow_lic_table = Table('assoc_ver_shallow_lic', Base.metadata,
Column('shallow_version_id', ForeignKey('base_version.id'), index=True),
Column('shallow_license_id', ForeignKey('license.id'), index=True)
)
class BaseVersion(Base):
__tablename__ = 'base_version'
__versioned__ = {}
id = Column(Integer, primary_key=True, info={'label': 'DB ID'})
deep_licenses = relationship('License', secondary=assoc_ver_deep_lic_table,
primaryjoin='base_version.c.id==assoc_ver_deep_lic.c.version_id',
secondaryjoin='assoc_ver_deep_lic.c.deep_license_id==license.c.id',
backref='version_from_deep_license', cascade='save-update')
licenses = relationship('License', secondary=assoc_ver_shallow_lic_table,
primaryjoin='base_version.c.id==assoc_ver_shallow_lic.c.shallow_version_id',
secondaryjoin='assoc_ver_shallow_lic.c.shallow_license_id==license.c.id',
info={'label': 'Licenses'}, cascade='save-update')
preferred_license_id = Column(Integer, ForeignKey('license.id'), index=True)
preferred_license = relationship('License', uselist=False, primaryjoin='OSSVersion.preferred_license_id==License.id',
info={'label': 'Preferred License'}, lazy='joined',
cascade='save-update')
__mapper_args__ = {
'polymorphic_identity':'base_version',
'polymorphic_on':type,
}
class OSSVersion(BaseVersion):
__tablename__ = 'oss_version'
__versioned__ = {}
id = Column(Integer, ForeignKey('base_version.id'), primary_key=True, info={'label': 'DB ID'})
__mapper_args__ = {
'polymorphic_identity':'version',
}
class UnspecifiedVersion(BaseVersion):
__tablename__ = 'unspecified_version'
__versioned__ = {}
id = Column(Integer, ForeignKey('base_version.id'), primary_key=True)
__mapper_args__ = {
'polymorphic_identity':'unspecified_version',
}
在测试中，我正在为某些License添加OSSVersion：
vers = DBSession.query(OSSVersion).filter(OSSVersion.id <= 100).order_by(OSSVersion.id).all()
lic = DBSession.query(License).order_by(License.id).first()
for v in vers:
v.licenses.append(lic)
v.preferred_license = lic
这失败如下：
INFO:sqlalchemy.engine.base.Engine:INSERT INTO oss_version_version (id, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 1, 'end_transaction_id': None, 'id': 101, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE oss_version_version SET end_transaction_id=%(end_transaction_id)s WHERE oss_version_version.transaction_id = (SELECT max(oss_version_version_1.transaction_id) AS max_1
FROM oss_version_version AS oss_version_version_1
WHERE oss_version_version_1.transaction_id < %(transaction_id_1)s AND oss_version_version_1.id = %(id_1)s) AND oss_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 101, 'transaction_id_1': 19L, 'id_1': 101, 'end_transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE base_version_version SET end_transaction_id=%(end_transaction_id)s WHERE base_version_version.transaction_id = (SELECT max(base_version_version_1.transaction_id) AS max_1
FROM base_version_version AS base_version_version_1
WHERE base_version_version_1.transaction_id < %(transaction_id_1)s AND base_version_version_1.id = %(id_1)s) AND base_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 101, 'transaction_id_1': 19L, 'id_1': 101, 'end_transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO base_version_version (id, component_id, major, minor, patch, minor_patch, freetext_version, unparsed_bd_version, bd_component_name, bd_component_kbid, bd_protex_componentversionid, bd_releasedate, minimum_filled, preferred_license_id, identification_type, editor, reviewer, type, temp_note, commercial_sw, manual_restrictions, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(component_id)s, %(major)s, %(minor)s, %(patch)s, %(minor_patch)s, %(freetext_version)s, %(unparsed_bd_version)s, %(bd_component_name)s, %(bd_component_kbid)s, %(bd_protex_componentversionid)s, %(bd_releasedate)s, %(minimum_filled)s, %(preferred_license_id)s, %(identification_type)s, %(editor)s, %(reviewer)s, %(type)s, %(temp_note)s, %(commercial_sw)s, %(manual_restrictions)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'major': 2L, 'identification_type': u'Email_Request', 'temp_note': u'Version originally imported from XYZ, row ID: 340, URL: https://int.net1/DispForm.aspx?ID=340', 'bd_component_name': None, 'end_transaction_id': None, 'preferred_license_id': 26, 'reviewer': None, 'id': 102, 'freetext_version': None, 'manual_restrictions': True, 'minimum_filled': True, 'editor': 'test_run_default_on_versions@ACME.com', 'bd_protex_componentversionid': u'1154740', 'type': u'version', 'minor': 60L, 'commercial_sw': False, 'unparsed_bd_version': u'2.60', 'minor_patch': None, 'component_id': 5, 'bd_component_kbid': u'gnuautoconf259', 'patch': None, 'transaction_id': 19L, 'operation_type': 1, 'bd_releasedate': datetime.datetime(2006, 6, 26, 0, 0)}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO oss_version_version (id, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 1, 'end_transaction_id': None, 'id': 102, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE oss_version_version SET end_transaction_id=%(end_transaction_id)s WHERE oss_version_version.transaction_id = (SELECT max(oss_version_version_1.transaction_id) AS max_1
FROM oss_version_version AS oss_version_version_1
WHERE oss_version_version_1.transaction_id < %(transaction_id_1)s AND oss_version_version_1.id = %(id_1)s) AND oss_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 102, 'transaction_id_1': 19L, 'id_1': 102, 'end_transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE base_version_version SET end_transaction_id=%(end_transaction_id)s WHERE base_version_version.transaction_id = (SELECT max(base_version_version_1.transaction_id) AS max_1
FROM base_version_version AS base_version_version_1
WHERE base_version_version_1.transaction_id < %(transaction_id_1)s AND base_version_version_1.id = %(id_1)s) AND base_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 102, 'end_transaction_id': 19L, 'id_1': 102, 'transaction_id_1': 19L}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO base_version_version (id, component_id, major, minor, patch, minor_patch, freetext_version, unparsed_bd_version, bd_component_name, bd_component_kbid, bd_protex_componentversionid, bd_releasedate, minimum_filled, preferred_license_id, identification_type, editor, reviewer, type, temp_note, commercial_sw, manual_restrictions, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(component_id)s, %(major)s, %(minor)s, %(patch)s, %(minor_patch)s, %(freetext_version)s, %(unparsed_bd_version)s, %(bd_component_name)s, %(bd_component_kbid)s, %(bd_protex_componentversionid)s, %(bd_releasedate)s, %(minimum_filled)s, %(preferred_license_id)s, %(identification_type)s, %(editor)s, %(reviewer)s, %(type)s, %(temp_note)s, %(commercial_sw)s, %(manual_restrictions)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'major': 2L, 'identification_type': u'Email_Request', 'temp_note': u'Version originally imported from XYZ, row ID: 340, URL: https://int.net1/DispForm.aspx?ID=340', 'bd_component_name': None, 'end_transaction_id': None, 'preferred_license_id': 26, 'reviewer': None, 'id': 103, 'freetext_version': None, 'manual_restrictions': True, 'minimum_filled': True, 'editor': None, 'bd_protex_componentversionid': u'1154743', 'type': u'version', 'minor': 63L, 'commercial_sw': False, 'unparsed_bd_version': u'2.63', 'minor_patch': None, 'component_id': 5, 'bd_component_kbid': u'gnuautoconf259', 'patch': None, 'transaction_id': 19L, 'operation_type': 1, 'bd_releasedate': datetime.datetime(2008, 9, 9, 0, 0)}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO oss_version_version (id, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 1, 'end_transaction_id': None, 'id': 103, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE oss_version_version SET end_transaction_id=%(end_transaction_id)s WHERE oss_version_version.transaction_id = (SELECT max(oss_version_version_1.transaction_id) AS max_1
FROM oss_version_version AS oss_version_version_1
WHERE oss_version_version_1.transaction_id < %(transaction_id_1)s AND oss_version_version_1.id = %(id_1)s) AND oss_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 103, 'end_transaction_id': 19L, 'id_1': 103, 'transaction_id_1': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE base_version_version SET end_transaction_id=%(end_transaction_id)s WHERE base_version_version.transaction_id = (SELECT max(base_version_version_1.transaction_id) AS max_1
FROM base_version_version AS base_version_version_1
WHERE base_version_version_1.transaction_id < %(transaction_id_1)s AND base_version_version_1.id = %(id_1)s) AND base_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 103, 'end_transaction_id': 19L, 'id_1': 103, 'transaction_id_1': 19L}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO base_version_version (id, component_id, major, minor, patch, minor_patch, freetext_version, unparsed_bd_version, bd_component_name, bd_component_kbid, bd_protex_componentversionid, bd_releasedate, minimum_filled, preferred_license_id, identification_type, editor, reviewer, type, temp_note, commercial_sw, manual_restrictions, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(component_id)s, %(major)s, %(minor)s, %(patch)s, %(minor_patch)s, %(freetext_version)s, %(unparsed_bd_version)s, %(bd_component_name)s, %(bd_component_kbid)s, %(bd_protex_componentversionid)s, %(bd_releasedate)s, %(minimum_filled)s, %(preferred_license_id)s, %(identification_type)s, %(editor)s, %(reviewer)s, %(type)s, %(temp_note)s, %(commercial_sw)s, %(manual_restrictions)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'major': 2L, 'identification_type': u'Email_Request', 'temp_note': u'Version originally imported from XYZ, row ID: 340, URL: https://int.net1/DispForm.aspx?ID=340', 'bd_component_name': None, 'end_transaction_id': None, 'preferred_license_id': 26, 'reviewer': None, 'id': 104, 'freetext_version': None, 'manual_restrictions': True, 'minimum_filled': True, 'editor': 'test_run_default_on_versions@ACME.com', 'bd_protex_componentversionid': u'1212226', 'type': u'version', 'minor': 67L, 'commercial_sw': False, 'unparsed_bd_version': u'2.67', 'minor_patch': None, 'component_id': 5, 'bd_component_kbid': u'gnuautoconf259', 'patch': None, 'transaction_id': 19L, 'operation_type': 1, 'bd_releasedate': datetime.datetime(2010, 8, 2, 0, 0)}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO oss_version_version (id, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 1, 'end_transaction_id': None, 'id': 104, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE oss_version_version SET end_transaction_id=%(end_transaction_id)s WHERE oss_version_version.transaction_id = (SELECT max(oss_version_version_1.transaction_id) AS max_1
FROM oss_version_version AS oss_version_version_1
WHERE oss_version_version_1.transaction_id < %(transaction_id_1)s AND oss_version_version_1.id = %(id_1)s) AND oss_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 104, 'end_transaction_id': 19L, 'id_1': 104, 'transaction_id_1': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE base_version_version SET end_transaction_id=%(end_transaction_id)s WHERE base_version_version.transaction_id = (SELECT max(base_version_version_1.transaction_id) AS max_1
FROM base_version_version AS base_version_version_1
WHERE base_version_version_1.transaction_id < %(transaction_id_1)s AND base_version_version_1.id = %(id_1)s) AND base_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 104, 'end_transaction_id': 19L, 'id_1': 104, 'transaction_id_1': 19L}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO base_version_version (id, component_id, major, minor, patch, minor_patch, freetext_version, unparsed_bd_version, bd_component_name, bd_component_kbid, bd_protex_componentversionid, bd_releasedate, minimum_filled, preferred_license_id, identification_type, editor, reviewer, type, temp_note, commercial_sw, manual_restrictions, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(component_id)s, %(major)s, %(minor)s, %(patch)s, %(minor_patch)s, %(freetext_version)s, %(unparsed_bd_version)s, %(bd_component_name)s, %(bd_component_kbid)s, %(bd_protex_componentversionid)s, %(bd_releasedate)s, %(minimum_filled)s, %(preferred_license_id)s, %(identification_type)s, %(editor)s, %(reviewer)s, %(type)s, %(temp_note)s, %(commercial_sw)s, %(manual_restrictions)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'major': 2L, 'identification_type': u'Email_Request', 'temp_note': u'Version originally imported from XYZ, row ID: 340, URL: https://int.net1/DispForm.aspx?ID=340', 'bd_component_name': None, 'end_transaction_id': None, 'preferred_license_id': 26, 'reviewer': None, 'id': 105, 'freetext_version': None, 'manual_restrictions': True, 'minimum_filled': True, 'editor': None, 'bd_protex_componentversionid': u'1154730', 'type': u'version', 'minor': 12L, 'commercial_sw': False, 'unparsed_bd_version': u'2.12', 'minor_patch': None, 'component_id': 5, 'bd_component_kbid': u'gnuautoconf259', 'patch': None, 'transaction_id': 19L, 'operation_type': 1, 'bd_releasedate': datetime.datetime(1996, 11, 26, 0, 0)}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO oss_version_version (id, transaction_id, end_transaction_id, operation_type) VALUES (%(id)s, %(transaction_id)s, %(end_transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 1, 'end_transaction_id': None, 'id': 105, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE oss_version_version SET end_transaction_id=%(end_transaction_id)s WHERE oss_version_version.transaction_id = (SELECT max(oss_version_version_1.transaction_id) AS max_1
FROM oss_version_version AS oss_version_version_1
WHERE oss_version_version_1.transaction_id < %(transaction_id_1)s AND oss_version_version_1.id = %(id_1)s) AND oss_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 105, 'transaction_id_1': 19L, 'id_1': 105, 'end_transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:UPDATE base_version_version SET end_transaction_id=%(end_transaction_id)s WHERE base_version_version.transaction_id = (SELECT max(base_version_version_1.transaction_id) AS max_1
FROM base_version_version AS base_version_version_1
WHERE base_version_version_1.transaction_id < %(transaction_id_1)s AND base_version_version_1.id = %(id_1)s) AND base_version_version.id = %(id_2)s
INFO:sqlalchemy.engine.base.Engine:{'id_2': 105, 'end_transaction_id': 19L, 'id_1': 105, 'transaction_id_1': 19L}
INFO:sqlalchemy.engine.base.Engine:SELECT oss_version.id AS oss_version_id, base_version.id AS base_version_id, base_version.component_id AS base_version_component_id, base_version.major AS base_version_major, base_version.minor AS base_version_minor, base_version.patch AS base_version_patch, base_version.minor_patch AS base_version_minor_patch, base_version.freetext_version AS base_version_freetext_version, base_version.unparsed_bd_version AS base_version_unparsed_bd_version, base_version.bd_component_name AS base_version_bd_component_name, base_version.bd_component_kbid AS base_version_bd_component_kbid, base_version.bd_protex_componentversionid AS base_version_bd_protex_componentversionid, base_version.bd_releasedate AS base_version_bd_releasedate, base_version.minimum_filled AS base_version_minimum_filled, base_version.preferred_license_id AS base_version_preferred_license_id, base_version.identification_type AS base_version_identification_type, base_version.editor AS base_version_editor, base_version.reviewer AS base_version_reviewer, base_version.type AS base_version_type, base_version.temp_note AS base_version_temp_note, base_version.commercial_sw AS base_version_commercial_sw, base_version.manual_restrictions AS base_version_manual_restrictions, license_1.id AS license_1_id, license_1.name AS license_1_name, license_1.full_name AS license_1_full_name, license_1.urls AS license_1_urls, license_1.notes AS license_1_notes, license_1.editor AS license_1_editor, license_1.reviewer AS license_1_reviewer, usecase_1.id AS usecase_1_id, usecase_1.name AS usecase_1_name, usecase_1.description AS usecase_1_description, effective_restriction_1.id AS effective_restriction_1_id, effective_restriction_1.version_id AS effective_restriction_1_version_id, effective_restriction_1.license_restriction_id AS effective_restriction_1_license_restriction_id, effective_restriction_1.requirement_type_id AS effective_restriction_1_requirement_type_id, effective_restriction_1.requirement_data AS effective_restriction_1_requirement_data, effective_restriction_1.usecase_id AS effective_restriction_1_usecase_id, effective_restriction_1.server_side AS effective_restriction_1_server_side, effective_restriction_1.req_overrides_license_id AS effective_restriction_1_req_overrides_license_id
FROM base_version JOIN oss_version ON base_version.id = oss_version.id LEFT OUTER JOIN license AS license_1 ON base_version.preferred_license_id = license_1.id LEFT OUTER JOIN effective_restriction AS effective_restriction_1 ON base_version.id = effective_restriction_1.version_id LEFT OUTER JOIN usecase AS usecase_1 ON usecase_1.id = effective_restriction_1.usecase_id
WHERE oss_version.id <= %(id_1)s ORDER BY oss_version.id
INFO:sqlalchemy.engine.base.Engine:{'id_1': 100}
INFO:sqlalchemy.engine.base.Engine:SELECT license.id AS license_id, license.name AS license_name, license.full_name AS license_full_name, license.urls AS license_urls, license.notes AS license_notes, license.editor AS license_editor, license.reviewer AS license_reviewer
FROM license ORDER BY license.id
LIMIT %(param_1)s
INFO:sqlalchemy.engine.base.Engine:{'param_1': 1}
INFO:sqlalchemy.engine.base.Engine:SELECT license.id AS license_id, license.name AS license_name, license.full_name AS license_full_name, license.urls AS license_urls, license.notes AS license_notes, license.editor AS license_editor, license.reviewer AS license_reviewer
FROM license, assoc_ver_shallow_lic
WHERE %(param_1)s = assoc_ver_shallow_lic.shallow_version_id AND license.id = assoc_ver_shallow_lic.shallow_license_id
INFO:sqlalchemy.engine.base.Engine:{'param_1': 1}
INFO:sqlalchemy.engine.base.Engine:UPDATE base_version SET preferred_license_id=%(preferred_license_id)s WHERE base_version.id = %(base_version_id)s
INFO:sqlalchemy.engine.base.Engine:{'base_version_id': 1, 'preferred_license_id': 1}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO assoc_ver_shallow_lic (shallow_version_id, shallow_license_id) VALUES (%(shallow_version_id)s, %(shallow_license_id)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 0, 'shallow_version_id': 1, 'shallow_license_id': 1}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO assoc_ver_shallow_lic_version (shallow_version_id, shallow_license_id, transaction_id, operation_type) VALUES (%(shallow_version_id)s, %(shallow_license_id)s, %(transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 0, 'shallow_version_id': 1, 'shallow_license_id': 1, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO assoc_ver_shallow_lic_version (shallow_version_id, shallow_license_id, transaction_id, operation_type) VALUES (%(shallow_version_id)s, %(shallow_license_id)s, %(transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 0, 'shallow_version_id': 1, 'shallow_license_id': 1, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:ROLLBACK
E
Error
Traceback (most recent call last):
File "C:\Program Files (x86)\Python271\Lib\unittest\case.py", line 329, in run
testMethod()
File "C:\ACME\Dev\projects\mysite\tests\model\task_dispatcher_time_consuming_test.py", line 209, in test_preflicmissing_check_groupkey_valid
v.licenses.append(lic)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\attributes.py", line 237, in __get__
return self.impl.get(instance_state(instance), dict_)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\attributes.py", line 578, in get
value = self.callable_(state, passive)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\strategies.py", line 529, in _load_for_state
return self._emit_lazyload(session, state, ident_key, passive)
File "<string>", line 1, in <lambda>
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\strategies.py", line 599, in _emit_lazyload
result = q.all()
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\query.py", line 2399, in all
return list(self)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\query.py", line 2515, in __iter__
self.session._autoflush()
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\session.py", line 1292, in _autoflush
util.raise_from_cause(e)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\util\compat.py", line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\session.py", line 1282, in _autoflush
self.flush()
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\session.py", line 2004, in flush
self._flush(objects)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\session.py", line 2122, in _flush
transaction.rollback(_capture_exception=True)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\util\langhelpers.py", line 60, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\session.py", line 2090, in _flush
self.dispatch.after_flush(self, flush_context)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\event\attr.py", line 254, in __call__
fn(*args, **kw)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy_continuum\manager.py", line 341, in after_flush
uow.process_after_flush(session)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy_continuum\unit_of_work.py", line 95, in process_after_flush
self.make_versions(session)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy_continuum\unit_of_work.py", line 308, in make_versions
self.create_association_versions(session)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy_continuum\unit_of_work.py", line 295, in create_association_versions
session.execute(stmt)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\orm\session.py", line 1023, in execute
bind, close_with_result=True).execute(clause, params or {})
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\engine\base.py", line 914, in execute
return meth(self, multiparams, params)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\sql\elements.py", line 323, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\engine\base.py", line 1010, in _execute_clauseelement
compiled_sql, distilled_params
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\engine\base.py", line 1146, in _execute_context
context)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\engine\base.py", line 1341, in _handle_dbapi_exception
exc_info
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\util\compat.py", line 199, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\engine\base.py", line 1139, in _execute_context
context)
File "C:\ACME\Dev\projects\mysite\ve\lib\site-packages\sqlalchemy\engine\default.py", line 450, in do_execute
cursor.execute(statement, parameters)
IntegrityError: (raised as a result of Query-invoked autoflush; consider using a session.no_autoflush block if this flush is occurring prematurely) (psycopg2.IntegrityError) duplicate key value violates unique constraint "assoc_ver_shallow_lic_version_pkey"
DETAIL: Key (transaction_id)=(19) already exists.
[SQL: 'INSERT INTO assoc_ver_shallow_lic_version (shallow_version_id, shallow_license_id, transaction_id, operation_type) VALUES (%(shallow_version_id)s, %(shallow_license_id)s, %(transaction_id)s, %(operation_type)s)'] [parameters: {'operation_type': 0, 'shallow_version_id': 1, 'shallow_license_id': 1, 'transaction_id': 19L}]
基本原因很明显：历史表assoc_ver_shallow_lic_version具有主键约束assoc_ver_shallow_lic_version_pkey，它必须是唯一的，而Continuum使用相同的transaction_id为它添加几条记录：
INFO:sqlalchemy.engine.base.Engine:INSERT INTO assoc_ver_shallow_lic_version (shallow_version_id, shallow_license_id, transaction_id, operation_type) VALUES (%(shallow_version_id)s, %(shallow_license_id)s, %(transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 0, 'shallow_version_id': 1, 'shallow_license_id': 1, 'transaction_id': 19L}
INFO:sqlalchemy.engine.base.Engine:INSERT INTO assoc_ver_shallow_lic_version (shallow_version_id, shallow_license_id, transaction_id, operation_type) VALUES (%(shallow_version_id)s, %(shallow_license_id)s, %(transaction_id)s, %(operation_type)s)
INFO:sqlalchemy.engine.base.Engine:{'operation_type': 0, 'shallow_version_id': 1, 'shallow_license_id': 1, 'transaction_id': 19L}
我在Pyramid中使用它，它生成了一个用于初始化db的脚本，虽然它主要由Base.metadata.create_all(engine)组成，但这导致了关联表的以下DDL：
CREATE TABLE "public"."assoc_ver_shallow_lic_version"
(
shallow_version_id int,
shallow_license_id int,
transaction_id bigint PRIMARY KEY NOT NULL,
end_transaction_id bigint,
operation_type smallint NOT NULL
)
;
CREATE UNIQUE INDEX assoc_ver_shallow_lic_version_pkey ON "public"."assoc_ver_shallow_lic_version"(transaction_id)
;
CREATE INDEX ix_assoc_ver_shallow_lic_version_operation_type ON "public"."assoc_ver_shallow_lic_version"(operation_type)
;
CREATE INDEX ix_assoc_ver_shallow_lic_version_shallow_version_id ON "public"."assoc_ver_shallow_lic_version"(shallow_version_id)
;
CREATE INDEX ix_assoc_ver_shallow_lic_version_shallow_license_id ON "public"."assoc_ver_shallow_lic_version"(shallow_license_id)
;
CREATE INDEX ix_assoc_ver_shallow_lic_version_transaction_id ON "public"."assoc_ver_shallow_lic_version"(transaction_id)
;
CREATE INDEX ix_assoc_ver_shallow_lic_version_end_transaction_id ON "public"."assoc_ver_shallow_lic_version"(end_transaction_id)
;
我注意到的一个令人担忧的方面是，当我运行is_versioned(assoc_ver_shallow_lic_table)时，我得到False。
是否有一些特殊的方法可以为Continuum配置多对多关联表，还是这个错误？
答案 0 :(得分：0)
SQLAlchemy-Continuum添加表的主键+ transaction_id作为版本表的主键。
如果您的多对多关联表未设置主键，它将仅添加transaction_id作为主键，从而导致插入失败，因为每次更改多对许多表将使用相同的主键添加到版本表中，这会导致DETAIL: Key (transaction_id)=(19) already exists.错误，因为所有操作都在同一事务中完成。
可以通过添加primary_key=True来设置关联表上的主键来解决此问题：
assoc_ver_shallow_lic_table = Table('assoc_ver_shallow_lic', Base.metadata,
Column('shallow_version_id', ForeignKey('base_version.id'), index=True, primary_key=True),
Column('shallow_license_id', ForeignKey('license.id'), index=True, primary_key=True)
)