INNER CODE UNIT · Python

validate_username

metafy-social/python-scripts · scripts/Authentication System using Flask/main.py:34

    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.")

class LoginForm(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("Login")

@app.route('/')
def home():
    return render_template('home.html')

@app.route('/dashboard', methods=["GET", "POST"])
@login_required
def dashboard():
    return render_template('dashboard.html')

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