Pwd = PasswordField(validators=)ĮqualTo("pwd", message="Passwords must match !"), "Usernames must have only letters, " "numbers, dots or underscores",Įmail = StringField(validators=) Length(3, 20, message="Please provide a valid name"), Registration form class register_form(FlaskForm): For the excluded import lines, see the GitHub repository. To keep this article neat and precise, I'll omit the import lines. The configuration for the forms is shown below. First, we need to prepare the two Flask forms before rendering them on the template. We still need to set up the login and registration forms. We then ensure that we are working within an application context, from which we can now call db.create all(), which will take care of our table creation. The deploy function imports the create_app function from the app.py file, Flask-Migrate migration methods, and the User model. To do this, run python manage.py on your terminal inside your project directory-assuming you got the setup right, installed the packages in the requirements.txt file, and have an active virtual environment.įrom flask_migrate import upgrade,migrate,init,stamp We currently have a User model, but we haven't yet created the table. If we don't include the UserMixin in our User model, we'll get errors like 'User' object has no attribute 'is_active'. Our work is simplified by using the UserMixin, which allows us to use methods such as is_authenticated(), is_active(), is_anonymous(), and get_id (). We import db, an instance of SQLAlchemy, and a UserMixin subclass from Flask-Login in the above code snippet. Pwd = db.Column(db.String(300), nullable=False, unique=True) Username = db.Column(db.String(80), unique=True, nullable=False)Įmail = db.Column(db.String(120), unique=True, nullable=False) Id = db.Column(db.Integer, primary_key=True) In the user table, we only need email, username, and password columns for this application. Now that we've completed our basic application factory, it's time to declare our User model. We do this to avoid the extensions initially binding themselves to the application, as explained here. Also, you'll notice that we have our initializations inside the application factory. (Source: ) def create_app():Īpp.config = "sqlite:///database.db"Īpp.config = Trueįlask-Login also requires that we set a secret key in order to function. The benefit of doing this within a function is that it allows for multiple application instances (also during testing). Instead of creating our Flask instance globally, we'll do so within a function because doing so globally becomes difficult as the project grows. We'll do the same for SQLAlchemy, Migrate, and Bcrypt. To use flask_login, we'll create an instance as shown above. We imported Flask, SQLAlchemy to help our Python application communicate with a database, Bcrypt for password hashing, Migrate for database migrations, and several other methods from Flask-Login for session management. This is vital for any Flask app.Īlso, we need to make some libraries available for use within our project, so we'll import the following: To kick it off, we'll create an application factory function inside the app.py file and call it create_app. Here's an overview of the app's structure: Basic Application Structureįor this application, we'll have a virtual environment in its own directory, as well as a folder containing the main application files. You can find a comprehensive guide on setting up and installing the project on my GitHub repository. This app includes features such as form validations, account creation, and login/logout functionality for authenticated users. For authentication, we'll use the Python library flask_login. In this article, we'll walk through the steps to create a user authentication web app with Flask, a micro web framework. This means you need to know about code structure and how to implement various security measures. When you're developing applications for the general public, it's important to protect your users' credentials and information.
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