Django PermissionRequiredMixin redirect to login template with message

Question

I got this view and I'm using PermissionRequiredMixin on it...it works fine but when I redirect to login template (set in settings LOGIN_URL) I need it shows a message there like "You don't have permission to do this". Any idea how to do it without creating a custom decorator, just using PermissionRequiredMixin itself?

from django.contrib.auth.mixins import PermissionRequiredMixin

class MyView(PermissionRequiredMixin,View):

    template = 'myapp/item_detail.html'
    permission_required = 'myapp.change_item'


    def get(self, request, *args, **kwargs):
        #Query here
        return render(request, self.template)

What do I need to add in order to achieve that?

Answer 1

You should use the messaging framework. To add your own message, simple overwrite:

from django.contrib import messages

class MyView(...):
    ...

    def handle_no_permission(self):
        # add custom message
        messages.error(self.request, 'You have no permission')
        return super(MyView, self).handle_no_permission()

you'll also need to add the following to your base.html (or login form):

{% if messages %}
<ul class="messages">
    {% for message in messages %}
        <li{% if message.tags %} class="{{ message.tags }}"{% endif %}>{{ message }}</li>
    {% endfor %}
</ul>
{% endif %}