RuntimeError: Working Outside of Application Context

Why This Happens

Flask uses contexts to make certain objects available. Outside a request handler, these contexts do not exist. You must manually create them for scripts and tests.

The Problem

from flask import current_app
app = create_app()
print(current_app.config['SECRET_KEY'])

The Fix

from flask import current_app
app = create_app()
with app.app_context():
    print(current_app.config['SECRET_KEY'])

Step-by-Step Fix

1. 1

   Use app.app_context()

   Wrap code in 'with app.app_context():'.

2. 2

   Check entry point

   Ensure Flask features are inside request handlers or contexts.

3. 3

   Pass app directly

   Instead of current_app, pass the app instance.