Flask-Migrate 未检测到表格

Question

我有以下项目结构：

project/__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()

然而，当我运行以下命令时，Flask-Migrate 未检测到任何要添加的表。

python manage.py db init

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

只输出：

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

为什么 Flask-Migrate with Alembic 没有检测到模型并因此创建了表？这是我尝试过的：

删除数据库，从零开始
在 manage.py 文件中创建自定义数据库 class，未检测到
谷歌搜索这个问题的每一个答案，发现了很多类似的问题，但 none 他们的解决方案对我有用。

编辑：

这里是 models.py 文件的例子

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

解决方案是像这样在 __init__.py 文件中导入模型：

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

我遇到了同样的问题。解决方案与@joe 的

完全相同

在路由文件中

from models import User

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

在project/__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 添加 api_user 名称空间时 flask_migrate 检测到模型

Flask-Migrate 未检测到表格

Flask-Migrate not detecting tables

python

postgresql

flask

flask-sqlalchemy

flask-migrate