Question

我具有以下项目结构：

项目/ __ init __。py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate

db = SQLAlchemy()
migrate = Migrate()

def create_app():
    app = Flask(__name__)
    app.config.from_object(os.environ['APP_SETTINGS'])

    db.init_app(app)
    migrate.init_app(app, db)

    return app

run.py

from project import create_app
app = create_app()

if __name__ == "__main__":
    app.run()

manage.py

from flask_script import Manager
from flask_migrate import MigrateCommand
from project.models import *
from project import create_app


manager = Manager(create_app)
manager.add_command('db', MigrateCommand)

if __name__ == '__main__':
    manager.run()

但是，当我运行以下命令时，Flask-Migrate并未检测到要添加的任何表。

python manage.py db init

哪个输出：

Creating directory $HOME/Project/migrations ... done
Creating directory $HOME/Project/migrations/versions ... done
Generating $HOME/Project/migrations/script.py.mako ... done
Generating $HOME/Project/migrations/env.py ... done
Generating $HOME/Project/migrations/README ... done
Generating $HOME/Project/migrations/alembic.ini ... done
Please edit configuration/connection/logging settings in
'$HOME/Project/migrations/alembic.ini' before proceeding.

和

python manage.py db migrate

仅输出：

INFO  [alembic.runtime.migration] Context impl PostgresqlImpl.
INFO  [alembic.runtime.migration] Will assume transactional DDL.

为什么Flask-Migrate with Alembic无法检测模型并因此创建表？这是我尝试过的：

从零开始删除数据库
在manage.py文件中创建自定义数据库类，不会检测到
使用Google搜索该问题的每个答案，发现了很多类似的问题，但是它们的解决方案都没有对我有用。

编辑：

这是models.py文件的示例

from flask import current_app
from project import db
from flask_login import UserMixin

class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))

Answer 1

解决方案是将模型导入__init__.py文件，如下所示：

def create_app():
    app = Flask(__name__)
    app.config.from_object(os.environ['APP_SETTINGS'])

    from project import models

    db.init_app(app)
    migrate.init_app(app, db)

    return app

Answer 2

我有同样的问题。该解决方案与@joe的解决方案非常相似

在路线文件中

from models import User

api_user = Namespace('user', description='user related operations')

在项目中/ __ init __。py

def create_app():
    app = Flask(__name__)
    app.config.from_object(os.environ['APP_SETTINGS'])

    from project import models

    db.init_app(app)
    migrate.init_app(app, db)

    blueprint = Blueprint('api', __name__, url_prefix=url_prefix)
    api = Api(blueprint, doc='/documentation')  # ,doc=False

    app.register_blueprint(blueprint)
    api.add_namespace(api_user)

return app

在create_app flask_migrate检测到的模型中添加api_user命名空间时

Flask-Migrate未检测到表

2 个答案: