app.py

from flask import Flask,render_template,url_for,request,redirect
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime,timezone
import os

app = Flask(__name__)
basedir = os.path.abspath(os.path.dirname(__file__))
app.config['SQLALCHEMY_DATABASE_URI'] = f'sqlite:///{os.path.join(basedir, "test.db")}'
# app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
db = SQLAlchemy(app)

class Todo(db.Model):
    id = db.Column(db.Integer ,primary_key=True)
    content = db.Column(db.String(200), nullable=False)
    date_created = db.Column(db.DateTime,default=lambda: datetime.now(timezone.utc))


    def __repr__(self):
        return '<Task %r>' % self.id


@app.route('/', methods=['POST', 'GET'])
def index():
    if request.method == 'POST':
        task_content = request.form['content']
        new_task = Todo(content=task_content)

        try:
            db.session.add(new_task)
            db.session.commit()
            return redirect('/')
        except:
            return 'There was an issue adding your task'
    else:
        tasks = Todo.query.order_by(Todo.date_created).all()
        return render_template('index.html', tasks=tasks)
    
@app.route('/delete/<int:id>')
def delete(id):
    task_to_delete = Todo.query.get_or_404(id)

    try:
        db.session.delete(task_to_delete)
        db.session.commit()
        return redirect('/')
    except:
        return 'There was a problem deleting that task'
    
@app.route('/update/<int:id>', methods=['GET','POST'])
def update(id):
    task = Todo.query.get_or_404(id)
    if request.method == 'POST':
        task.content = request.form['content']

        try:
            db.session.commit()
            return redirect('/')
        except:
            return 'There was an issue updating your task'
    else:
        return render_template('update.html', task=task)
with app.app_context():
        db.create_all()
        
if __name__ == "__main__":
    
    #     print("Database and tables created!")
    app.run(debug=True)