如何插入帶有多對多關係的記錄？

我有一個類Consignments在這個類我有一個Sims類的關係：如何插入帶有多對多關係的記錄？

class Consignments(Base): 
    __tablename__ = "consignments" 
    id = Column(
     Integer, 
     Sequence('consignments_id', optional=True), 
     primary_key=True 
    ) 
    consignment_agents_id = Column(Integer, ForeignKey(Agents.id))  
    consignment_agent = relationship(
     Agents, 
     primaryjoin=Agents.id == consignment_agents_id, 
     uselist=False, 
     backref="consignments" 
    ) 
    consignment_teamleader_id = Column(Integer, ForeignKey(Agents.id)) 
    consignment_teamlead = relationship(
     Agents, 
     primaryjoin=Agents.id == consignment_teamleader_id, 
     uselist=False, 
     backref="team_consignments" 
    ) 
    consignment_timestamp = Column(DateTime, index=True) 
    created_by_agent_id = Column(Integer, ForeignKey(Agents.id)) 
    created_by_agent = relationship(
     Agents, 
     primaryjoin=Agents.id == created_by_agent_id, 
     uselist=False, 
     backref="created_consignments" 
    ) 
    transactions_id = Column(Integer, ForeignKey(Transactions.id)) 
    transaction = relationship(Transactions, backref="consignments", uselist=False) 
    status = Column(Unicode(40), index=True) 
    complete_stamp = Column(DateTime, index=True) 

    sims = relationship(Sims, secondary=consignment_to_sim, backref="consignments")

注意：sims的關係consignment_to_sim這是一個表：

consignment_to_sim = Table(
    "consignment_to_sim", 
    Base.metadata, 
    Column("sims_iccid", Unicode(40), ForeignKey("sims.iccid"), primary_key=True, onupdate="cascade"), 
    Column(
     "consignments_id", 
     Integer, 
     ForeignKey("consignments.id"), 
     primary_key=True 
    ) 
)

現在我綁添加一種貨物如：

@task 
def do_consignment_task(store): 
    s = sqlahelper.get_session() 
    consign = store.gen_consignment() 
    ca = Agents.by_id(store.consignment_agents_id) 
    consign.consignment_agents_id = store.consignment_agents_id 
    consign.consignment_teamleader_id = ca.ou[0].lead_agents_id 
    consign.consignment_timestamp = func.now() 
    consign.created_by_agent_id = store.consignment_agents_id 
    consign.complete_stamp = func.now() 
    consign.status = "SUCCESS" 
    for sim in store.sims: 
     consign.sims.append(sim) 
    s.add(consign) 
transaction.savepoint()

store.sims是一個模擬列表。

上面的代碼給我下面的錯誤：

IntegrityError: (IntegrityError) (1062, "Duplicate entry '1302-37050' for key 'PRIMARY'", None)

我都試過，沒有運氣從這個question建議。我也看過這個question

1 -我在做什麼錯在我的實例？
2 -如何插入多對多表格？我可以使用sqlalchemy.sql.expression.insert插入多對多嗎？

只是爲了以防萬一，這裏是全traceback

來源

2014-07-24 Renier

這是一個奇怪的錯誤消息。多對多表的主鍵應該是複合的，我認爲你做了，但它只顯示重複條目的單個值？ – TheSoundDefense

這對我來說也是奇怪的，我無法弄清楚......如果你看看追溯，37050應該是第二個值。 – Renier

你有沒有想過這個？ – TheSoundDefense

我已經找到了解決我的問題，我只是說在for循環檢查：

for sim in store.sims: 
    if sim in consign.sims: 
     continue 
    else: 
     consign.sims.append(sim) 
s.add(consign)

雖然沒有重複進入列表中，這似乎解決了它。
我希望這可以幫助某人。

來源

2014-08-07 06:23:33 Renier

如何插入帶有多對多關係的記錄？

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