flask_app/app.py # ... @app .route ( '/create/' , methods = ( 'GET' , 'POST' ) ) def create ( ) : return render_template ( 'create.html' ) Inside the function, you use the get_db_connection() function to open a database connection and execute a SQL query to get the blog post associated with the given post_id value. You add the fetchone() method to get the result and store it in the post variable then close the connection. If the post variable has the value None, meaning no result was found in the database, you use the abort() function you imported earlier to respond with a 404 error code and the function will finish execution. If however, a post was found, you return the value of the post variable.

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To solve this problem, either stop the server that’s currently running via CTRL+C, then run flask run again, or if you want to run both applications at the same time, you can pass a different port number to the -p argument, for example, to run another application on port 5001 use the following command: You import the db database object from the app.extensions module. Then you create a Flask-SQLAlchemy database model called Post using the db.Model class. In the model, you have an ID integer column as a primary key ( id), a column to hold strings for the post title ( title), and a text column for content ( content). You use the special __repr__() method to provide a string representation for each post object using its title. For more on Flask-SQLAlchemy, you can review How to Use Flask-SQLAlchemy to Interact with Databases in a Flask Application. app .register_blueprint (posts_bp , url_prefix = '/posts' ) from app .questions import bp as questions_bpflask_app/app.py from flask import Flask , render_template , request , url_for , flash , redirect # ... You register the questions blueprint as you did with the posts blueprint, adding a /questions prefix to its routes. You handle POST requests inside the if request.method == 'POST' condition. You extract the title and content the user submits from the request.form object. If the title is empty, you use the flash() function to flash the message Title is required!. You do the same in case of empty content. If you stop your app and open up a Python REPL, you can create the database using the create_all method on the db object: Next, make a parent directory for your Flask project. Move into the directory with the cd command after you create it:

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This works well so far, but it can go wrong when you request a greeting for a user who doesn’t exist. To demonstrate how the Flask debugger works, visit the following URL: http://127.0.0.1:5000/users/3 flask_app/app/templates/base.html

flask_blog/app.py . . . @app .route ( '/create' , methods = ( 'GET' , 'POST' ) ) def create ( ) : if request .method == 'POST' : title = request .form [ 'title' ] content = request .form [ 'content' ] if not title : flash ( 'Title is required!' ) else : conn = get_db_connection ( ) conn .execute ( 'INSERT INTO posts (title, content) VALUES (?, ?)' , (title , content ) ) conn .commit ( ) conn .close ( ) return redirect (url_for ( 'index' ) ) return render_template ( 'create.html' ) The global request object to access incoming request data that will be submitted via the HTML form you built in the last step.Once you have verified that the routes are behaving as expected, you can create the templates. Step 4 — Creating Templates To run your web application, you’ll first tell Flask where to find the application (the hello.py file in your case) with the FLASK_APP environment variable: