[英]Error creating table with foreign key constraint using SQLAlchemy-Migrate
我在python中構建一個應用程序。 我正在使用sqlalchemy-migrate來跟蹤我的數據庫架構。 我有一個表user_category,它有兩列:id和name。 我正在嘗試使用user_category表的外鍵創建一個用戶表。 我創建用戶表的更改腳本如下:
from sqlalchemy import *
from migrate import *
from migrate.changeset import *
meta = MetaData()
user_category = Table('user_category', meta)
user = Table('user', meta,
Column('id', Integer, primary_key=True),
Column('email', String(255)),
Column('first_name', String(40)),
Column('surname', String(40)),
Column('password', String(255)),
Column('user_category', Integer, ForeignKey("user_category.id")),
)
def upgrade(migrate_engine):
# Upgrade operations go here. Don't create your own engine; bind migrate_engine
# to your metadata
meta.bind = migrate_engine
user.create()
def downgrade(migrate_engine):
# Operations to reverse the above upgrade go here.
meta.bind = migrate_engine
user.drop()
當我運行'manage.py test'時,我得到並且錯誤:
sqlalchemy.exc.NoReferencedColumnError: Could not create ForeignKey 'user_catego
ry.id' on table 'user': table 'user_category' has no column named 'id'
可以告訴SQLAlchemy從數據庫中自動加載表結構,而不是復制粘貼user_category
表的定義:
from sqlalchemy import *
from migrate import *
from migrate.changeset import *
meta = MetaData()
user = Table('user', meta,
Column('id', Integer, primary_key=True),
Column('email', String(255)),
Column('first_name', String(40)),
Column('surname', String(40)),
Column('password', String(255)),
Column('user_category', Integer, ForeignKey("user_category.id")),
)
def upgrade(migrate_engine):
_t = sa.Table('user_category', meta, autoload=True)
meta.bind = migrate_engine
user.create()
抱歉回復晚了 :)
您聲稱您的“user_category”表具有名稱和ID。 “user_category”的定義根本不包含任何列:)
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