how to use parameters in add_url_rule flask

Question

I am trying to create a script to basically create all the flask endpoint from existing python classes/methods.

one way which i came across was app.add_url_rule

but it is not working for me

@app.route('/username/<username>')
def userstatus(username):
    print("user is logged in")
app.add_url_rule('/username/', 'userstatus', defaults={"username":None})**

the above one is working but if i remove @app.route('/username/<username>') and try juust with add_url_rule, it is not working.

You can't remove the @app.route..., period. It has to be there. — VirxEC
– VirxEC, Commented Sep 29, 2020 at 19:43
so is there any way to use existing python files and its function and generate all the endpoints dynamically? — name
– name, Commented Sep 29, 2020 at 19:49
So i have a python class Users. I want to change all its methods to endpoints without changing anything in this Users class. So i want to access all the methods of Users class in another python class and use app.add_url_rule('/username/', 'userstatus', defaults={"username":None}, there are other classes with many methods, and endpoint generation should be common for all. so i dont want to add "@app.route" in every class on every method. Is there a way to do that?? I am able to pull the classes and its methods + arguments already — name
– name, Commented Sep 29, 2020 at 19:57

oschlueter · Accepted Answer · 2020-09-29 20:02:05Z

You have to provide the rule, the end point and the view function to add_url_rule (see API doc):

from flask import Flask

app = Flask(__name__)


def userstatus(username):
    return f'Hello {username}!'


app.add_url_rule('/username/<username>', '/username/<username>', userstatus)

Then you can start your flask app:

(venv) $ FLASK_APP=url_rule.py flask run
 * Serving Flask app "url_rule.py"
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

And send queries in a different shell (or your browser):

$ curl http://localhost:5000/username/alice && echo
Hello alice!
$ curl http://localhost:5000/username/bob && echo
Hello bob!

You could then use your existing python files and call add_url_rule for the endpoints you want to create dynamically.

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