应用程序工厂模式

应用程序工厂模式

本文介绍了将Flask的Click CLI与应用程序工厂模式一起使用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

限时删除!!

我使用应用程序工厂模式定义我的Flask应用程序。当使用Flask-Script时,我可以将工厂函数传递给

flask 命令是使用 flask.cli创建的Click接口.FlaskGroup 。创建自己的组并将其传递给工厂功能。使用 app.shell_context_processor 将对象添加到shell。

  from flask从flask.cli中导入Flask 
从flask.sqlalchemy中导入FlaskGroup
SQLAlchemy
$ b db = SQLAlchemy()
$ b $ def shell_context():
返回{'app':app,'db':db}
$ b $ def create_app(script_info = None):
app = Flask(__ name__)
db.init_app(app)
...
app.shell_context_processor(shell_context)
返回应用程序
$ b cli = FlaskGroup(create_app = create_app)

@cli。命令
def custom_command():
传递
$ b $如果__name__ =='__main__':
cli()
/ pre>

运行您的文件而不是 flask 命令。你会得到你的工厂的Click界面。

  FLASK_DEBUG = 1 python app.py run 






理想情况下,创建一个入口点并将其安装到您的环境中。然后,您可以将该脚本作为命令调用。创建一个 setup.py 文件,至少包含以下内容:

 项目/ 
应用程式/
__init__.py
setup.py





  from setuptools import setup,find_packages 

setup(
name ='my_app',
version ='1.0.0',
packages = find_packages(),
entry_points = {
'console_scripts':[$ b $'app = app:cli',




$ b

  pip install -e / path / to / project 
FLASK_DEBUG = 1 app run


I define my Flask application using the app factory pattern. When using Flask-Script, I can pass the factory function to the Manager. I'd like to use Flask's built-in Click CLI instead. How do I use the factory with Click?

My current code uses Flask-Script. How do I do this with Click?

from flask import Flask
from flask_script import Manager, Shell

def create_app():
    app = Flask(__name__)
    ...
    return app

manager = Manager(create_app)

def make_shell_context():
    return dict(app=app, db=db, User=User, Role=Role)

manager.add_command('shell', Shell(make_context=make_shell_context))

if __name__ == '__main__':
    manager.run()
解决方案

The flask command is a Click interface created with flask.cli.FlaskGroup. Create your own group and pass it the factory function. Use app.shell_context_processor to add objects to the shell.

from flask import Flask
from flask.cli import FlaskGroup
from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()

def shell_context():
    return {'app': app, 'db': db}

def create_app(script_info=None):
    app = Flask(__name__)
    db.init_app(app)
    ...
    app.shell_context_processor(shell_context)
    return app

cli = FlaskGroup(create_app=create_app)

@cli.command
def custom_command():
    pass

if __name__ == '__main__':
    cli()

Run your file instead of the flask command. You'll get the Click interface using your factory.

FLASK_DEBUG=1 python app.py run


Ideally, create an entry point and install your package in your env. Then you can call the script as a command. Create a setup.py file with at least the following.

project/
    app/
        __init__.py
    setup.py
from setuptools import setup, find_packages

setup(
    name='my_app',
    version='1.0.0',
    packages=find_packages(),
    entry_points={
        'console_scripts': [
            'app=app:cli',
        ],
    },
)
pip install -e /path/to/project
FLASK_DEBUG=1 app run

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09-06 12:04