Fix handling of missing lines in wishlist views (#3053)

src/oscar/apps/customer/wishlists/views.py

 # -*- coding: utf-8 -*-
 from django.contrib import messages
-from django.core.exceptions import (
-    MultipleObjectsReturned, ObjectDoesNotExist, PermissionDenied)
+from django.core.exceptions import ObjectDoesNotExist, PermissionDenied
 from django.http import Http404
 from django.shortcuts import get_object_or_404, redirect
 from django.urls import reverse
     """
 
     def fetch_line(self, user, wishlist_key, line_pk=None, product_pk=None):
-        self.wishlist = WishList._default_manager.get(
-            owner=user, key=wishlist_key)
         if line_pk is not None:
-            self.line = self.wishlist.lines.get(pk=line_pk)
+            self.line = get_object_or_404(
+                Line,
+                pk=line_pk,
+                wishlist__owner=user,
+                wishlist__key=wishlist_key,
+            )
         else:
-            self.line = self.wishlist.lines.get(product_id=product_pk)
+            try:
+                self.line = get_object_or_404(
+                    Line,
+                    product_id=product_pk,
+                    wishlist__owner=user,
+                    wishlist__key=wishlist_key,
+                )
+            except Line.MultipleObjectsReturned:
+                raise Http404
+        self.wishlist = self.line.wishlist
         self.product = self.line.product
 
 
 
     def get_object(self, queryset=None):
         self.fetch_line(
-            self.request.user, self.kwargs['key'],
-            self.kwargs.get('line_pk'), self.kwargs.get('product_pk'))
+            self.request.user,
+            self.kwargs['key'],
+            self.kwargs.get('line_pk'),
+            self.kwargs.get('product_pk')
+        )
         return self.line
 
     def get_context_data(self, **kwargs):
 class WishListMoveProductToAnotherWishList(LineMixin, View):
 
     def dispatch(self, request, *args, **kwargs):
-        try:
-            self.fetch_line(request.user, kwargs['key'],
-                            line_pk=kwargs['line_pk'])
-        except (ObjectDoesNotExist, MultipleObjectsReturned):
-            raise Http404
-        return super().dispatch(
-            request, *args, **kwargs)
+        self.fetch_line(request.user, kwargs['key'], line_pk=kwargs['line_pk'])
+        return super().dispatch(request, *args, **kwargs)
 
     def get(self, request, *args, **kwargs):
         to_wishlist = get_object_or_404(

tests/functional/customer/test_wishlists.py

         self.get(url)
         self.assertEqual(self.wishlist1.lines.filter(product=self.product).count(), 0)
         self.assertEqual(self.wishlist2.lines.filter(product=self.product).count(), 1)
+        # Test WishList doesnt contain line and return 404
+        self.assertEqual(self.get(url, expect_errors=True).status_code, 404)
+
+
+class TestWishListRemoveProduct(WishListTestMixin, WebTestCase):
+
+    def setUp(self):
+        super().setUp()
+        self.wishlist = WishListFactory(owner=self.user)
+        self.wishlist.add(self.product)
+        self.line = self.wishlist.lines.get(product=self.product)
+
+    def test_remove_wishlist_line(self):
+        delete_wishlist_line_url = reverse_lazy(
+            'customer:wishlists-remove-product', kwargs={'key': self.wishlist.key, 'line_pk': self.line.pk}
+        )
+        self.get(delete_wishlist_line_url).forms[0].submit()
+        # Test WishList doesnt contain line and return 404
+        self.assertEqual(self.get(delete_wishlist_line_url, expect_errors=True).status_code, 404)
+
+    def test_remove_wishlist_product(self):
+        delete_wishlist_product_url = reverse_lazy(
+            'customer:wishlists-remove-product', kwargs={'key': self.wishlist.key, 'product_pk': self.line.product.id}
+        )
+        self.get(delete_wishlist_product_url).forms[0].submit()
+        # Test WishList doesnt contain line and return 404
+        self.assertEqual(self.get(delete_wishlist_product_url, expect_errors=True).status_code, 404)