我正在尝试学习一些 Flask,我正在使用 Flask-Migrate 1.6.0
所以我做了一个看起来像这样的模型
class Download(db.Model):
__tablename__ = "downloads"
id = db.Column(db.Integer, autoincrement=True, primary_key=True)
filename = db.Column(db.String, nullable=False)
size = db.Column(db.Integer, nullable=False)
location = db.Column(db.String, nullable=False)
season = db.Column(db.Integer, nullable=False)
download_timestamp = db.Column(db.DateTime, nullable=False)
show_id = db.Column(db.Integer, ForeignKey("shows.id"))
def __init__(self,filename,size,location,timestamp,season):
self.filename = filename
self.size = size
self.location = location
self.download_timestamp = timestamp
self.season = season
def __repr__(self):
return '<File {}'.format(self.filename)
然后我将其更改为完全相同的内容,除了这一行:
size = db.Column(db.BigInteger, nullable=False)
当我运行我的
manager.py db migrate
命令它不检测列类型的变化。而且我已经阅读了它并且我知道当我更改我的 env.py 并添加 compare_type=True 变量时它应该选择它。但是我这样做没有用,方法现在看起来像这样
def run_migrations_online():
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
# this callback is used to prevent an auto-migration from being generated
# when there are no changes to the schema
# reference: http://alembic.readthedocs.org/en/latest/cookbook.html
def process_revision_directives(context, revision, directives):
if getattr(config.cmd_opts, 'autogenerate', False):
script = directives[0]
if script.upgrade_ops.is_empty():
directives[:] = []
logger.info('No changes in schema detected.')
engine = engine_from_config(config.get_section(config.config_ini_section),
prefix='sqlalchemy.',
poolclass=pool.NullPool)
connection = engine.connect()
context.configure(connection=connection,
target_metadata=target_metadata,
compare_type=True,
process_revision_directives=process_revision_directives,
**current_app.extensions['migrate'].configure_args)
try:
with context.begin_transaction():
context.run_migrations()
finally:
connection.close()
好的,我的问题是:
我是不是在更改 env.py 文件时做错了什么?
如果我没有,它仍然没有接收到它,我该如何手动进行下一次迁移修订?因为我的 migrate 文件夹中的修订具有如下名称和这样的内容
# revision identifiers, used by Alembic.
revision = '7e9f264b0f'
down_revision = '2e59d536f50'
我想我可以只复制一个,编一个名字..但是下一个被 flask migrate 拾取的会识别它吗?所以是的.. 没有太多不稳定的黑客攻击的正确处理方法是什么?
最佳答案
只需要在Migrate构造函数中加入compare_type=True
from flask_migrate import Migrate
migrate = Migrate(compare_type=True)
app = Flask(__name__)
migrate.init_app(app)
关于postgresql - Flask-migrate 和更改列类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33944436/