Django: Certain users get random 404 error - django

Question

I'm facing a strange issue that I can't handle on my own.
In normal cases when users click on a link, then they are directed to a page where they can edit their hook baits (objects). However, certain users get 404 errors, but I don't know why because the page is rendered for most users.
html where the link is
<div class="row justify-content-center mx-2" >
<div class="col-12 p-0">
<ul class="list-group text-center custom-borders m-2 p-0">
{% if own_hookbaits.count == 0 %}
<a href="{% url 'user_profile:hookbaits' request.user.fisherman.fisherman_id %}" class="list-group-item" >No hook baits yet</a>
{% else %}
{% for hookbait in own_hookbaits %}
{{ hookbait.name }}
{% endfor %}
{% endif %}
</ul>
</div>
views.py
class HookBaitUpdateView(UpdateView):
model = HookBait
template_name = "user_profile/hookbaits.html"
form_class = HookBaitForm
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['formset'] = HookBaitFormset(queryset=HookBait.objects.filter(fisherman=self.request.user.fisherman))
return context
def post(self, request, *args, **kwargs):
formset = HookBaitFormset(request.POST)
if formset.is_valid():
return self.form_valid(formset)
else:
return self.form_invalid(formset)
def form_valid(self, formset):
instances = formset.save(commit=False)
for instance in instances:
instance.fisherman = self.request.user.fisherman
instance.save()
return super().form_valid(formset)
def form_invalid(self, formset):
return HttpResponse("Invalid")
def get_success_url(self):
return reverse('user_profile:profile', args=(self.kwargs['pk'],))
urls.py
app_name = "user_profile"
urlpatterns = [
path("profile/<int:pk>/", views.ProfileView.as_view(), name="profile"),
path("profile/<int:pk>/hookbaits/", views.HookBaitUpdateView.as_view(), name="hookbaits"),
]
rendered html
<div class="row justify-content-center m-0">
<div class="col-12 col-md-6 col-lg-4 p-0">
<div class="row mx-3 my-3 justify-content-center text-center">
<div class="card p-2 custom-borders">
<div class="card-body p-2">
<form method="POST">
{% csrf_token %}
<table class="d-flex justify-content-center">
{{ formset.management_form }}
{% for form in formset %}
<tr class="formset_row">
{% for field in form.visible_fields %}
<td class="pb-2">
{% if form.instance.pk %}{{ form.DELETE }}{% endif %}
{% if forloop.first %}
{% for hidden in form.hidden_fields %}
{{ hidden }}
{% endfor %}
{% endif %}
{{ field.errors }}
{{ field }}
</td>
{% endfor %}
</tr>
{% endfor %}
</table>
<input type="submit" class="btn btn-primary w-50 mt-1" style="background-color: #00754B;" value="Mentés">
</form>
</div>
</div>
</div>
</div>
</div>
Any suggestions what the solution would be? Thanks!

Answer 1

there are some possibilities
the wrong link clicked like if your trying access this URL profile/25/hookbaits/
and in the data index there is no HookBait with the id of 25
in HookBaitUpdateView you are trying to get queryset=HookBait.objects.filter(fisherman=self.request.user.fisherman)
maybe there is no hookbait associate with user.fisherman
404 page mostly served when you call get_object_or_404(HookBait, pk=25)
and update view may call this method