How to use ModelMultipleChoiceField - django

Question

I am trying to create a website that allows users to follow certain stocks and read articles based on what they follow. I am having trouble creating a form for them to follow stocks as a user's Profile and Stocks have a many to many relationship, I believe I am supposed to use ModelMultipleChoiceField but cannot get it to work.
models.py
from django.db import models
from django.contrib.auth.models import User
from django.dispatch import receiver
from django.db.models.signals import post_save
class Stock(models.Model):
name = models.CharField(max_length = 50)
ticker = models.CharField(max_length = 50)
def __str__(self):
return self.name
class Profile(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE)
followed_stocks = models.ManyToManyField(Stock, blank=True)
def __str__(self):
return self.user.username
#receiver(post_save, sender=User)
def update_user_profile(sender, instance, created, **kwargs):
if created:
Profile.objects.create(user=instance)
instance.profile.save()
class Article(models.Model):
stock = models.ForeignKey(Stock, on_delete=models.CASCADE, default = 0 )
title = models.CharField(max_length = 200)
url = models.URLField()
description = models.TextField()
def __str__(self):
return self.title
forms.py
from django import forms
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from .models import Stock
from django.forms import ModelMultipleChoiceField
class ProfileRegistrationForm(UserCreationForm):
class Meta:
model = User
fields = ('username', 'password1', 'password2', 'email', 'first_name' ,'last_name')
class StockFollowForm():
stocks = forms.ModelMultipleChoiceField(queryset=Stock.objects.all())
views.py
def test(request):
if request.method == "POST":
form = StockFollowForm(request.POST)
if form.is_valid():
request.user.profile.followed_stocks = form.cleaned_data.get('stocks_selected')
request.user.save()
return redirect('index')
else:
form = StockFollowForm()
return render(request, 'core/test.html',{'form': form})
template:
{% block body %}
<div class = "container">
<h2 class = "text-center">Register</h2>
<form method = 'post'>
{% csrf_token %}
{{ form }}
<div class = "text-center">
<br/>
<button class="btn btn-primary" type = 'submit'>Login</button>
</div>
</form>
</div>
{% endblock %}
When I run this code no form is displayed. Thanks in advance for your help!

Answer 1

I think your form class has to inherit from djangos form, like the docs show.
Change
class StockFollowForm():
to
from django import forms
class StockFollowForm(forms.Form):