Python Alchemy Blueprint中的应用程序工厂初始化问题

我对应用程序工厂的初始化有问题。我正在使用蓝图和炼金术。 这是我的程序结构

App_v1
 app.py
 config.py
 App_Py
       main
           __init__.py
           forms.py
           views.py
       static
       templates
       __init__.py
      app_v1.db
      models.py

app.py

from App_Py import create_app
app=create_app()

if __name__=='__main__':
app.run(debug=True,port=4044)

config.py

import os
basedir = os.path.abspath(os.path.dirname(__file__))

class Config(object):
SECRET_KEY = ‘wdsfqsqdsqsdfqsqsdsq’
SQLALCHEMY_DATABASE_URI = 'sqlite:///'+os.path.join(basedir,'app_v1.db')
SQLALCHEMY_TRACK_MODIFICATIONS = False

应用程序 init.py

import os
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager
from config import Config

db = SQLAlchemy()
migrate=Migrate()
login_manager = LoginManager()
login_manager.login_view = 'users.login'

def create_app(config_class=Config):
  app = Flask(__name__)
  app.config.from_object(config_class)

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

  from App_Py.main.views import main
  app.register_blueprint(main)
  return app

models.py

from App_Py import db,login_manager
from werkzeug.security import generate_password_hash,check_password_hash
from flask_login import UserMixin

类用户（db.Model，UserMixin）：

在主文件夹内 views.py

当我运行程序时，在命令提示符下点击Python时，我无法承诺创建用户数据库：

from App_Py import db
from App_Py.models import User

u= User(username=‘dqfq’,email=‘one@one.com’,password=‘test’)
db.session.add(u)
db.session.commit()

提交时，出现一个错误，表示无法提交。如何在烧瓶中初始化应用程序工厂。我之所以使用应用程序工厂，是因为我将使用弹性搜索用于以后的目的。 谢谢你的建议

错误：

(venv) iMac:App_Py_v1 symtech$ python
Python 3.6.4 (v3.6.4:d48ecebad5, Dec 18 2017, 21:07:28) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from App_Py import db
>>> from App_Py.models import User
>>> u=User(username='David',email='david@gmail.com',password='test')
>>> db.session.add(u)
Traceback (most recent call last):
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-     packages/sqlalchemy/util/_collections.py", line 999, in __call__
return self.registry[key]
KeyError: 4320752448

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-   packages/sqlalchemy/orm/scoping.py", line 153, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-   packages/sqlalchemy/util/_collections.py", line 1001, in __call__
return self.registry.setdefault(key, self.createfunc())
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site- packages/sqlalchemy/orm/session.py", line 2950, in __call__
return self.class_(**local_kw)
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 141, in __init__
self.app = app = db.get_app()
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site- packages/flask_sqlalchemy/__init__.py", line 912, in get_app
'No application found. Either work inside a view function or push'
RuntimeError: No application found. Either work inside a view function or    push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/.
>>> >>>

我注意到（刚才）您正试图从命令行提交用户。您可能缺少提交到db的任何应用程序上下文。有关从命令行添加用户的解决方案，请参见以下url：

我目前正在使用的另一个解决方案是在main.py甚至create_app函数中添加以下内容

    from App_Py import db
    from App_Py.models import User

    @app.before_first_request
    def load_user():
        u=User(username='David',email='david@gmail.com',password='test')
        db.session.add(u)
        db.session.commit()

---

请提供在调试模式下运行的完整错误消息？我已发布错误。我无法找出问题所在？问题似乎发生在提交函数上。根据错误消息，检查此项以获取可能的解决方案。通过使用app.app_context（）进行更改，错误仍然存在。能否将此添加到“代码”字段中的问题中？我看不出你在用什么缩进。

(venv) iMac:App_Py_v1 symtech$ python
Python 3.6.4 (v3.6.4:d48ecebad5, Dec 18 2017, 21:07:28) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from App_Py import db
>>> from App_Py.models import User
>>> u=User(username='David',email='david@gmail.com',password='test')
>>> db.session.add(u)
Traceback (most recent call last):
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-     packages/sqlalchemy/util/_collections.py", line 999, in __call__
return self.registry[key]
KeyError: 4320752448

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-   packages/sqlalchemy/orm/scoping.py", line 153, in do
return getattr(self.registry(), name)(*args, **kwargs)
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-   packages/sqlalchemy/util/_collections.py", line 1001, in __call__
return self.registry.setdefault(key, self.createfunc())
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site- packages/sqlalchemy/orm/session.py", line 2950, in __call__
return self.class_(**local_kw)
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 141, in __init__
self.app = app = db.get_app()
File "/Users/symtech/Desktop/App_Py/App_Py_v1/venv/lib/python3.6/site- packages/flask_sqlalchemy/__init__.py", line 912, in get_app
'No application found. Either work inside a view function or push'
RuntimeError: No application found. Either work inside a view function or    push an application context. See http://flask-sqlalchemy.pocoo.org/contexts/.
>>> >>>

def create_app(config_class=Config):
app = Flask(__name__)
app.config.from_object(config_class)

with app.app_context():
  db.init_app(app)
  migrate.init_app(app, db)
  ...........

  from APP_Py.users.views import users
  app.register_blueprint(users)
  ......

  return app

    from App_Py import db
    from App_Py.models import User

    @app.before_first_request
    def load_user():
        u=User(username='David',email='david@gmail.com',password='test')
        db.session.add(u)
        db.session.commit()