deleting objects, going from ListView to DeleteView

Question

I have a ListView and from this I want to delete some objects using DeleteView. What I have so far:

views.py

class BlockListView(ListView):
    model= Classroom

    def get_context_data(self, **kwargs):
        context = super(BlockListView, self).get_context_data(**kwargs)
        classroom_blocks = Classroom.objects.all()
        context = {'classroom_blocks': classroom_blocks}
        return context

list_classroom_view = BlockListView.as_view()

class BlockDeleteView(DeleteView):
    model = Classroom
    success_url = reverse_lazy('classroom:blocklist')

delete_classroom_view = BlockDeleteView.as_view()

urls.py

urlpatterns = [
    path(r'^$', views.index, name='index'),
    path('submitted', views.submitted, name='submitted'),
    path('classup/', create_classroom_view, name='classroom'),
    path('block/', views.block, name='block'),
    path('blocklist/', list_classroom_view, name='blocklist'),
    path(r'^(?P<pk>\d+)/blockDelete/$', delete_classroom_view, name='blockDelete'),
]

template for listview:

{% for block in classroom_blocks %}
    <li>{{ block.get_course_block_display }}<a href ="{% url 'classroom:blockDelete' block.id %}" class="button" style="color:#999999">DELETE</a></li>
{% empty %}
    <li>No classes set up yet.</li>
{% endfor %}

template for confirm delete:

{% block body %}
<h1>Confirm Delete</h1>
<form action="." method="post">{% csrf_token %}
    <p>Are you sure you want to delete "{{ object.course_block }}"?</p>
    <input type="submit" value="Confirm" />
</form>
{% endblock %}

After I click the delete button from the listview, the url generated is http://127.0.0.1:8000/classroom/%5E(%3FP89%5Cd+)/blockDelete/$ and this directs to the confirm delete page. After confirming delete, I get a 404 error with Request URL: http://127.0.0.1:8000/classroom/%5E(%3FP89%5Cd+)/blockDelete/

Alasdair · Accepted Answer · 2018-08-14 20:10:07Z

1

You are using path(), so you shouldn't be using regexes. Change the first and last URL patterns to:

path('', views.index, name='index'),
...
path('<int:pk>/blockDelete/', delete_classroom_view, name='blockDelete'),

Now, when you click on the delete button from the list view, you should be taken to a url like /classroom/1/blockDelete/, and you shouldn't get a 404 when you submit the form.

answered Aug 14, 2018 at 20:10

Alasdair

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