Just learn flask, to add data to the database does not seem to be added, the front end is an empty array, how should I find out the reason? - Codes Helper

Just learn flask, to add data to the database does not seem to be added, the front end is an empty array, how should I find out the reason?

from flask import Flask, session
from flask import render_template
from flask_script import Manager
from flask import url_for
from flask import request, jsonify, json

from flask_cors import CORS

from flask_sqlalchemy import SQLAlchemy
import os

from flask_marshmallow import Marshmallow

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


app = Flask(__name__)

cors = CORS(app, resources={r"/*": {"origins": "*"}})
app.config["SECRET_KEY"] = "a string"
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///" + \
                                        os.path.join(basedir, "data.sqlite")

-sharp 
app.config["SQLALCHEMY_COMMIT_TEARDOWN"] = True

app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False

manager = Manager(app)
db = SQLAlchemy(app)
ma = Marshmallow(app)


class Article(db.Model):
    """docstring for Article"""
    __tablename__ = "articles"
    id = db.Column(db.Integer, primary_key = True)
    title = db.Column(db.String(64))
    content = db.Column(db.Text)

class ArticleSchema(ma.ModelSchema):
    class Meta:
        medel = Article

@app.route("/")
def index():
    articles = Article.query.all()
    articles_schema = ArticleSchema()
    output = articles_schema.dump(articles).data
    return jsonify({"articles": output})


@app.route("/create", methods=["POST"])
def create():
    title = request.form["title"]
    content = request.form["content"]
    article = Article(title=title, content=content)
    db.session.add(article)
    session["known"] = False
    
    return content


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