The view didn't return an HttpResponse object. It returned None instead

I have the following simple view. Why is it resulting in this error?

The view auth_lifecycle.views.user_profile didn't return an HttpResponse object. It returned None instead.

"""Renders web pages for the user-authentication-lifecycle project."""
from django.shortcuts               import render
from django.template                import RequestContext
from django.contrib.auth            import authenticate, login

def user_profile(request):
    """Displays information unique to the logged-in user."""

    user = authenticate(username='superuserusername', password='sueruserpassword')
    login(request, user)

    render(request, 'auth_lifecycle/user_profile.html',
           context_instance=RequestContext(request))

Because the view must return render, not just call it. Change the last line to

return render(request, 'auth_lifecycle/user_profile.html',
           context_instance=RequestContext(request))

if qs.count()==1:
        print('cart id exists')
        if ....
       
else:    
        return render(request,"carts/home.html",{})

Such type of code will also return you the same error this is because of the intents as the return statement should be for else not for if statement.

above code can be changed to

if qs.count()==1:
        print('cart id exists')
        if ....
       
else:   
         
return render(request,"carts/home.html",{})

This may solve such issues

I had the same error using an UpdateView

I had this:

if form.is_valid() and form2.is_valid():
	form.save()
	form2.save()
	return HttpResponseRedirect(self.get_success_url())

and I solved just doing:

if form.is_valid() and form2.is_valid():
	form.save()
	form2.save()
	return HttpResponseRedirect(reverse_lazy('adopcion:solicitud_listar'))

Python is very sensitive to indentation, with the code below I got the same error:

    except IntegrityError as e:
        if 'unique constraint' in e.args:
            return render(request, "calender.html")

The correct indentation is:

    except IntegrityError as e:
        if 'unique constraint' in e.args:
        return render(request, "calender.html")

I know this is very late to post something here but this may help out someone to figure out the silly mistake.

That there are chances that you a re missing return before render(). please make sure that.

I have the same issue but resolved it by returning the render after saving the data.

    error_message = None
    if not first_name:
        error_message = "first name is required!!!!"
    elif len(first_name) < 4:
        error_message = "first name must be more than 4 characters!!!"

    elif not error_message:
        signup_obj = Signuup(firstname=first_name, lastname=last_name, email=email, password=password)
        print("here is the complete object!!!!")

        signup_obj.register()
        

    else:
        return render(request, 'signup.html', {'error': error_message})

Issue: After saving data if I do not have any error_message to show but I am not returning anything after saving.

Solution Error solved after adding

  signup_obj.register()
  return render(request, 'signup.html')

In the code....