heading and the content in a

tag. In the index route, you render a template file with the path posts/index.html which means that Flask will look for a directory called posts in the templates directory and then look for an index.html file inside of the posts directory. You import the database object and the questions model, then use db.create_all() to create the table, and finally you add two question objects to the database session and commit the transaction.The global request object to access incoming request data that will be submitted via the HTML form you built in the last step. You can create a style.css style sheet file to add CSS to your application. First, create a directory called static inside your main flask_blog directory: You register the posts blueprint using the app.register_blueprint() method by passing it the posts_bp blueprint object. You also pass it a value '/posts' for the url_prefix parameter, which will prefix the blueprint’s routes with this string. For example, the main / route of the posts blueprint will become accessible via /posts/, and the /categories route will be at /posts/categories/. Most of this code is standard HTML. It will display an input box for the post title, a text area for the post content, and a button to submit the form.

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In the if statement you ensure that the code following it is only executed when the request is a POST request via the comparison request.method == 'POST'. This file will have the function to create the app, which will initialize the database and register the blueprints. At the moment, this will not do much, but it will be needed for the rest of the app. The -m flag is for module-name. This command will execute the module venv to create a new virtual environment named auth. This will create a new directory containing bin, include, and lib subdirectories. And a pyvenv.cfg file. With this, the users of your application can now write new blog posts and add them to the database, edit, and delete existing posts. Conclusion You can now add new posts and edit existing ones. Next, you’ll add a button to allow users to delete existing posts. Step 5 — Deleting PostsBy the end of the tutorial, you will have built a Flask application with the following structure: . Once the file finishes execution, a new file called database.db will appear in your flask_app directory. This means you’ve successfully set up your database.

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Note: This tutorial is limited in scope and does not cover advanced persisting of sessions. Furthermore, modifying the data type for the primary key or considerations for migrating to different database systems are also outside of the scope of this introductory tutorial. 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 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: Here, you import the db database object from the app.extensions module. Then you create a model called Question using the db.Model class. In the model, you have an ID integer column as a primary key ( id), a text column for the question’s content ( content), and a text column for its answer ( answer). Then you use the special __repr__() method to represent each question using its content.

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Flask has many community-made Flask extensions. The following is a list of extensions you might consider using to make your development process easier: The create_app() function is the Flask application factory function. It creates an application instance called app from the Flask() class using the familiar app = Flask(__name__) line. You configure the application by importing configuration values from an object using the app.config.from_object() method, passing it the value of the config_class parameter, which holds the Config class as a default value. You will initialize your Flask extensions below the # Initialize Flask extensions here comment and register your application blueprints below the # Register blueprints here comment once you create them.

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You display the title using a literal variable delimiter ( {{ ... }}). Remember that post will be a dictionary-like object, so you can access the post title with post['title']. You also display the post creation date using the same method.

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When developing a web application, you will frequently run into situations where the application displays an error instead of the behavior you expect. You may misspell a variable or forget to define or import a function. To make fixing these problems easier, Flask provides a debugger when running the application in development mode. In this step, you will learn how to fix errors in your application using the Flask debugger.