jakerieger/flaskintroduction

Repo for my tutorial on freeCodeCamp.org

Howdy 👋

Just a dude that likes to make computers do things. Memory and low level code gets me hot and bothered. Aspiring graphics programmer. I'm in an abusive relationship with C++, please help.

• 🎓 Instructor at freeCodeCamp
• 🏫 Cybersec Engineering major

flaskintroduction's Issues

RuntimeError: Working outside of application context. when creating SQLite DB

macOS Venture 13.4
Python 3.11.3

>>> from app import db
>>> db.create_all()

returns

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'db' is not defined
>>> 
KeyboardInterrupt
>>> from app import db
>>> db.create_all()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/fthobe/dev/tagverified/env/lib/python3.11/site-packages/flask_sqlalchemy/extension.py", line 884, in create_all
    self._call_for_binds(bind_key, "create_all")
  File "/Users/fthobe/dev/tagverified/env/lib/python3.11/site-packages/flask_sqlalchemy/extension.py", line 855, in _call_for_binds
    engine = self.engines[key]
             ^^^^^^^^^^^^
  File "/Users/fthobe/dev/tagverified/env/lib/python3.11/site-packages/flask_sqlalchemy/extension.py", line 636, in engines
    app = current_app._get_current_object()  # type: ignore[attr-defined]
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/fthobe/dev/tagverified/env/lib/python3.11/site-packages/werkzeug/local.py", line 508, in _get_current_object
    raise RuntimeError(unbound_message) from None
RuntimeError: Working outside of application context.
This typically means that you attempted to use functionality that needed
the current application. To solve this, set up an application context
with app.app_context(). See the documentation for more information.

when trying to create db from following code:

#Load the applications you need to run for your first webserver, render templates and link to static files
from flask import Flask, render_template, url_for
#Load the SQL Connector
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
#Create an app that hosts the service 
app = Flask(__name__)
#Specify where the local SQLITE DB is located
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
#Specify what initialises the DB point to your app.py
db = SQLAlchemy(app)
#Start defining the DB and the columns
    #Define a progressively numbered integer given by the DB for every item in the list
    #A primary key is a column or group of columns used to identify the uniqueness of rows in a table. Each table has one and only one primary key.
    #A db.string contains the task and can be maximum 200 characters long, nullable indicates that it can not be empty.
    #Adds a boolean for every task created
    #SQLite does not have a separate Boolean storage class. Instead, Boolean values are stored as integers 0 (false) and 1 (true).
    #SQLite recognizes the keywords "TRUE" and "FALSE", as of version 3.23.0 (2018-04-02) but those keywords are really just alternative spellings for the integer literals 1 and 0 respectively.
    
class Todo(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    content = db.Column(db.String(200), nullable=False)
    completed = db.Column(db.Integer, default=0)
    date_created = db.Column(db.DateTime, default=datetime.utcnow)

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

with app.app_context():
    db.create_all()
#"app.route" tell your server to which url it should respond. "/" means your base folder such as example.com/
@app.route('/')

def index():
    return render_template('index.html')

if __name__ == '__main__':
#app.run starts the app and contains variables and configures the app to run on localhost ("host=0.0.0.0"), the port (you can use a different one than 80) and sets it in debug mode ("debug=True")
    app.run(host='0.0.0.0', port=80, debug=True)

any idea?

Attribute missing in the example

hey Jake running through the code and getting'Todo' has no attribute 'date_created' this could be me but I cannot figure it out for the life of me.

Every time I press "Add Task", it takes me to the "there was an issue adding your task" page, however, after returning back to the homepage, I can see that the task was successfully inserted.

Every time I press "Add Task", it takes me to the "there was an issue adding your task" page, however, after returning back to the homepage, I can see that the task was successfully inserted. what is our mistake :(

Encountered an application error when deployed on Heroku using python 3.10.4

Heroku error logs

app[web.1]: from collections import Mapping
app[web.1]: ImportError: cannot import name 'Mapping' from 'collections' (/app/.heroku/python/lib/python3.10/collections/__init__.py)
app[web.1]: [2022-06-06 01:04:01 +0000] [9] [INFO] Worker exiting (pid: 9)
heroku[web.1]: State changed from starting to up
app[web.1]: [2022-06-06 01:04:01 +0000] [4] [INFO] Shutting down: Master
app[web.1]: [2022-06-06 01:04:01 +0000] [4] [INFO] Reason: Worker failed to boot.
heroku[web.1]: Process exited with status 3
heroku[web.1]: State changed from up to crashed
heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=xxx1stflasktodoapp.herokuapp.com request_id=a7537c8d-1ea1-4ab0-9e05-184b2ea55c36 fwd="160.97.243.190" dyno= connect= service= status=503 bytes= protocol=https
heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=xxx1stflasktodoapp.herokuapp.com request_id=df90230f-ab93-4718-849d-58a7c81993c2 fwd="160.97.243.190" dyno= connect= service= status=503 bytes= protocol=https

Track sheet

Track Sheet.xlsx