我正在尝试将alembic库连接到数据库和sqlalchemy库。作为指南，我使用此示例 链接
我的项目文件：
数据库.py
from databases import Database
from sqlalchemy import MetaData, create_engine
DATABASE_URL = "postgresql://....@localhost:5432/db"
engine = create_engine(DATABASE_URL)
metadata = MetaData()
database = Database(DATABASE_URL)
模型.py
from sqlalchemy import Table, Column, Integer, String, DateTime
from sqlalchemy.sql import func
from db import metadata
notes = Table(
"notes",
metadata,
Column("id", Integer, primary_key=True),
Column("title", String(50)),
Column("description", String(50)),
Column("created_date", DateTime, default=func.now(), nullable=False),
)
env.py（蒸馏器设置）
from db import DATABASE_URL, metadata
....
#add new
target_metadata = metadata
...
#change
def run_migrations_online():
config.set_main_option('sqlalchemy.url', str(DATABASE_URL))
connectable = engine_from_config(
config.get_section(config.config_ini_section),
prefix="sqlalchemy.",
poolclass=pool.NullPool,
)
当我跑
alembic revision --autogenerate -m 'Add notest table'
迁移/版本中的新文件创建此上下文
def upgrade():
# ### commands auto generated by Alembic - please adjust! ###
pass
# ### end Alembic commands ###
def downgrade():
# ### commands auto generated by Alembic - please adjust! ###
pass
# ### end Alembic commands ###
我想这可能与使用 target_metadata = metadata 变量有关。似乎一切都按照说明进行，但迁移没有按预期工作。