Django - Form-Select field set as not required not working - django

Question

I have a form and want to make some fields not required.
It's working for most, but pairing_rum field (and a few others) are causing some difficulties. For this question I removed the other fields as they are in the same format as rum_pairing.
Here is what I tried so far:
using the same format as venue ie forms.ModelChoiceField(queryset = Venue.objects.all() - but how can I filter to only get the choices contained within the field of the model?
I also tried to modify the forms __init__, but no luck (example below - sorry for the formatting, stack is not letting me putting it in a code format)
def init(self, *args, **kwargs):
super(ReviewRating, self).init(*args, **kwargs)
self.fields['pairing_rum'].required = False
Which renders the following error:
super(type, obj): obj must be an instance or subtype of type
What would be the best way to make pairing_rum field not requried?
My current code is as follows:
models
class ReviewRating(models.Model):
user = models.ForeignKey(User,blank=True,null=True, on_delete=models.SET_NULL, related_name="usercomments") product=models.ForeignKey(Product,related_name="comments",null=True, on_delete=models.SET_NULL)
pairing_coffee = models.IntegerField(choices=COFFEE_PAIRING, default=0, blank=True, null=True)
pairing_rum = models.IntegerField(choices=RUM_PAIRING, default=0, blank=True, null=True)
pairing_gin = models.IntegerField(choices=GIN_PAIRING, default=0, blank=True, null=True)
pairing_whisky = models.IntegerField(choices=WHISKY_PAIRING, default=0, blank=True, null=True)
pairing_event = models.ForeignKey(CatalogueEvent, related_name="pairing_event",on_delete=models.SET_NULL,blank=True, null=True)
pairing_venue = models.ForeignKey(Catalogue, related_name="pairing_venue",on_delete=models.SET_NULL,blank=True, null=True)
review =models.TextField(max_length=250, blank=True)
rating =models.IntegerField(choices=RATING, default=0)
venue = models.ForeignKey(Venue, blank=True, null=True, related_name="venues", on_delete=models.SET_NULL)
forms
class ReviewForm(forms.ModelForm):
venue = forms.ModelChoiceField(queryset = Venue.objects.all(),required=False)
class Meta:
model = ReviewRating
fields = ['review', 'rating','venue','pairing_coffee', 'pairing_rum','pairing_gin','pairing_whisky', 'pairing_event','pairing_venue']
widgets = {
'venue': forms.TextInput(attrs={'class':'form-select', 'placeholder':'Enter name'}),
'pairing_coffee': forms.Select(attrs={'class':'form-select', 'placeholder':'Enter name'}),
'pairing_rum': forms.Select(attrs={'class':'form-select', 'placeholder':'Enter name'}),
'pairing_gin': forms.Select(attrs={'class':'form-select', 'placeholder':'Enter name'}),
'pairing_whisky': forms.Select(attrs={'class':'form-select', 'placeholder':'Enter name'}),
'pairing_event': forms.Select(attrs={'class':'form-select', 'placeholder':'Enter name'}),
'pairing_venue': forms.Select(attrs={'class':'form-select', 'placeholder':'Enter name'}),
}
views
def show_product(request, product_id):
url = request.META.get('HTTP_REFERER')
product = Product.objects.get(pk=product_id)
form = ReviewForm()
submitted = False
data = Product.objects.filter(pk=product_id).annotate(
avg_rating =Avg('comments__rating'),)
if request.method == "POST" and 'btnreview_form' in request.POST:
form = ReviewForm(request.POST)
if form.is_valid():
data = form.save(commit=False)
data.product_id = product_id
data.user_id = request.user.id
data.save()
form.save()
return redirect(url)
else:
print(form.errors)
else:
print(form.errors)
return render(request,"main/show_product.html", {'form':form, 'submitted':submitted, 'product':product, 'venue_form':venue_form, 'data':data})
template
{% if user.is_authenticated %}
<form action="{% url 'show-product' product.id%}" method="POST">
{% csrf_token %}
<div class="rate">
<input type="radio" name="rating" id="rating1" value="1" required /><label for="rating1" title="1"></label>
<input type="radio" name="rating" id="rating2" value="2" required /><label for="rating2" title="2"></label>
<input type="radio" name="rating" id="rating3" value="3" required /><label for="rating3" title="3"></label>
<input type="radio" name="rating" id="rating4" value="4" required /><label for="rating4" title="4"></label>
<input type="radio" name="rating" id="rating5" value="5" required /><label for="rating5" title="5"></label>
</div>
{%if product.category == 1 %}
{{ form.pairing_rum|as_crispy_field }}
{%endif%}
{%if product.category == 2 %}
{{ form.pairing_gin|as_crispy_field }}
{%endif%}
{%if product.category == 3 %}
{{ form.pairing_whisky|as_crispy_field }}
{%endif%}
{%if product.category == 8 %}
{{ form.pairing_coffee|as_crispy_field }}
{%endif%}
{{ form.review|as_crispy_field }}
{{ form.venue|as_crispy_field }}
{% comment %} <a class="btn btn-outline-secondary btn-sm" href ="" data-toggle="modal" data-target="#AddVenueFormModal" ><font size="3px" color="#008083">Can't find the venue?</font></a> {% endcomment %}
<input type="submit" name="btnreview_form" value="Submit Review" class="btn btn-primary custom-btn">
</form>
</br>
{% else %}
{% endif %}
EDITED to add Traceback
The traceback indicates there is a problem at form.save(commit=False)
[23/Dec/2022 13:53:39] "GET /show_product/109 HTTP/1.1" 200 15414
Internal Server Error: /show_product/109
Traceback (most recent call last):
File "C:\Users\CeX\Virtual\lib\site-packages\django\core\handlers\exception.py", line 55, in inner
response = get_response(request)
File "C:\Users\CeX\Virtual\lib\site-packages\django\core\handlers\base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "C:\Users\CeX\Dev\mysite\main\views.py", line 760, in show_product
data = form.save(commit=False)
File "C:\Users\CeX\Virtual\lib\site-packages\django\forms\models.py", line 539, in save
raise ValueError(
ValueError: The ReviewRating could not be created because the data didn't validate.
New edit following Iain Shelvington's recommendation the error is the following:
Ironically, this is the code that I did deem necessary to be in the post that is causing the problem. Which is weird considering this is a pure copy/paste of the pairing_rum. 'pairing_rum` even when empty does not return any error message, but the others do.
[23/Dec/2022 14:21:50] "GET /show_product/109 HTTP/1.1" 200 15430
<ul class="errorlist"><li>pairing_coffee<ul class="errorlist"><li>Select a valid choice. 0 is not one of the available choices.</li></ul></li><li>pairing_gin<ul class="errorlist"><li>Select a valid choice. 0 is not one of the available choices.</li></ul></li><li>pairing_whisky<ul class="errorlist"><li>Select a valid choice. 0 is not one of the available choices.</li></ul></li></ul>