CODEWITHSUNDEEP
pythonhtmlflaskflask-wtforms
Jon_belt
Jon_belt

Reputation: 105

Error: "TypeError: hidden_tag() missing 1 required positional argument: 'self' " in Flask, python

I've been creating a forum based learning system, similar to stack overflow for an assessed project. I'm fairly new to flask, however I believe i have a decent understanding of python. I have been following Corey Schafer's Flask tutorials and adapting them to my project. Whenever I try to access the page called 'adduser', a webpage with a form for adding users, I get the error:

"TypeError: hidden_tag() missing 1 required positional argument: 'self'".

I have no idea what this means or how to even attempt to fix it. I assumed that I might find the fix in the HTML for the 'adduser' page, and after removing the '{{ form.hidden_tag() }}' tag, I got a different error, which leads me to believe that the error is has something to do with the 'forms.py' file and the 'addUser.html' file.

forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField, BooleanField
from wtforms.validators import DataRequired, Length, Email, EqualTo, ValidationError
from itroom.models import User

class LoginForm(FlaskForm):
    email = StringField('Email',validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    remember = BooleanField('Remember Me')
    submit = SubmitField('Login')

class AddUserForm(FlaskForm):
    email = StringField('Email',validators=[DataRequired(), Email()])
    password = PasswordField('Password', validators=[DataRequired()])
    submit = SubmitField('Add User')

    def validate_email(self,email):
        user = User.query.filter_by(userEmail=email.data).first()
        if user:
            raise ValidationError('Email already exists in database.')

addUser.html

{% extends "template.html" %}
{% block content %}

  <div class="center2" style="border-color: white;">
  <h2 align="center" style="padding: 2.5%;"></h2>
    <h1>Add a User</h1>   
      <form method="POST" action="">
         {{ form.hidden_tag() }}
        <div class="form-group">
          {{form.email.label}}
          {% if form.email.errors %}
          {{form.email(size=30, class="form-control is-invalid")}}
        <div class="invalid-feedback">
          {% for error in form.email.errors %}
          <span>{{ error }}</span>
          {% endfor %}
        </div>
          {% else %}
          {{form.email(size=30, class="form-control")}}
          {% endif %}
        </div>
          {{form.password.label}} <br>
          {{form.password(size=30)}}

          {{form.submit(class="btn btn-outline-info")}} <br>

      </form>
      </div>
{% endblock content %}

I also thought the routes file may be helpful aswell.

routes.py

from flask import Flask, render_template, url_for, flash, redirect
from itroom import app, db, bcrypt
from itroom.forms import LoginForm, AddUserForm
from itroom.models import User, Post
from flask_login import login_user

@app.route("/")
@app.route("/home")     #defines the HTML loaded for /home
def home():
    return render_template('home.html', title='Home')


@app.route("/login", methods=['GET', 'POST'])       #defines the HTML loaded for /login
def login():
    form = LoginForm('')
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.userEmail.data).first()
        if user and bcrypt.check_password_hash(user.userPassword, form.password):
            login_user(user, remember=form.remember.data)
            return redirect(url_for('home'))
        else:
            flash('Login Unsucessful, Please check email and password') 
    return render_template('login.html',form=form, title='Login')

@app.route("/adduser", methods=['GET', 'POST'])       #defines the HTML loaded for /adduser
def addUser():
    form = AddUserForm('/login')
    if form.validate_on_submit():
        hashed_password = bcrypt.generate_password_hash(form.password.data).decode ('utf-8')
        user = User(userEmail=form.email.data, userPassword = hashed_password)
        db.session.add(user)
        db.session.commit()
        temptext = ("Account created for '", form.email.data, "'." )
        flash(temptext)

    else:
        flash('Account not created')
    return render_template('addUser.html', title='Admin', form=AddUserForm)

Thank you in advance for anyone who tries to help!

Upvotes: 4

Views: 6646

Answers (3)

T-merd shop
T-merd shop

Reputation: 11

Well, me following the same tutorial from Corey Schafer's flask. The main reason why you are getting TypeError: hidden_tag() missing 1 required positional argument: 'self is because of the route page form the bracket needs to prevent the error and to signify the tag function()

Upvotes: 1

Dat_guy_who_hangs_out
Dat_guy_who_hangs_out

Reputation: 69

You forgot to call the form at the end of your last return statement.

current code 

else:
    flash('Account not created')
return render_template('addUser.html', title='Admin', form=AddUserForm)

fixed code

else:
    flash('Account not created')
return render_template('addUser.html', title='Admin', form=AddUserForm())

or since you already specified that

form = AddUserForm('/login')

just specify it at the end like you did in other routes

return render_template('addUser.html', title='Admin', form=form)

Upvotes: 5

Bob
Bob

Reputation: 1070

The TypeError is saying that self was not passed to the hidden_tag method. You can have this error if you do the following by accident: 

class A:
    def test(self):
        print('test')

A.test() # TypeError: test() missing 1 required positional argument: 'self'
A().test() # prints test

So this means that you are calling the method with a class object.

In your routes, you have the following rule where you pass a class to your page, but you likely wanted to return your actual form object. So you have to change

return render_template('addUser.html', title='Admin', form=AddUserForm)

to

form = AddUserForm('/login')
...
return render_template('addUser.html', title='Admin', form=form)

Upvotes: 8

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