Question

我有一个changeset脚本，我正在尝试向现有的表列添加外键约束。它看起来像：

from sqlalchemy import *
from migrate import *
import datetime

metadata = MetaData()

registrations = Table('registrations', metadata,
    Column('id', Integer(), primary_key=True),
    Column('date', DateTime(), nullable=False, index=True,
           default=datetime.datetime.now),
    Column('device_id', String(255), nullable=False, index=True)
)

devices = Table('devices', metadata,
    Column('id', String(255), primary_key=True),
    Column('user_id', Integer(), ForeignKey('users.id'), nullable=False,
           index=True),
    Column('created', DateTime(), nullable=False, index=True, 
           default=datetime.datetime.now)
)

cons = ForeignKeyConstraint([registrations.c.device_id], [devices.c.id])

def upgrade(migrate_engine):
    metadata.bind = migrate_engine
    cons.create()

def downgrade(migrate_engine):
    metadata.bind = migrate_engine
    cons.drop()

当我测试更改时，SQLAlchemy抱怨：

sqlalchemy.exc.OperationalError: (OperationalError) no such table: registrations 'INSERT INTO registrations SELECT * from migration_tmp' ()

看起来它正在进行表交换以更改架构。有没有人碰到这个？难道我做错了什么？或者有解决方法吗？

编辑：我用sqlite测试这个。这是我的manage.py：

from migrate.versioning.shell import main
main(url='sqlite:///development.db', debug='False', repository='migrations')

使用mysql方言似乎工作正常。可以隔离到sqlite。

Python SqlAlchemy-Migrate添加ForeignKeyConstraint时出错

0 个答案: