INNER CODE UNIT · Python

load_user

metafy-social/python-scripts · scripts/Authentication System using Flask/main.py:20

def load_user(user_id):
    return User.query.get(int(user_id))


class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(20), nullable=False, unique=True)
    password = db.Column(db.String(80), nullable=False)

class RegistrationForm(FlaskForm):
    username = StringField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Username"})
    password = PasswordField(validators=[InputRequired(), Length(min=4, max=20)], render_kw={"placeholder": "Password"})
    submit = SubmitField("Register")

    def validate_username(self, username):
        existing_user_username = User.query.filter_by(username=username.data).first()
        if existing_user_username:
            raise ValidationError("That username already exists! Try a different one.")

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