new save FBVs, methods & test methods

src/apps/dashboard/forms.py

@@ -33,3 +33,6 @@ class ExistingListItemForm(ItemForm):
         if self.instance.list.item_set.filter(text=text).exists():
             raise forms.ValidationError(DUPLICATE_ITEM_ERROR)
         return text
+    
+    def save(self):
+        return forms.models.ModelForm.save(self)

src/apps/dashboard/tests/test_forms.py

@@ -49,3 +49,10 @@ class ExistingListItemFormTest(TestCase):
         form = ExistingListItemForm(for_list=list_, data={"text": "twins, basil"})
         self.assertFalse(form.is_valid())
         self.assertEqual(form.errors["text"], [DUPLICATE_ITEM_ERROR])
+
+    def test_form_save(self):
+        mylist = List.objects.create()
+        form = ExistingListItemForm(for_list=mylist, data={"text": "howdy"})
+        self.assertTrue(form.is_valid())
+        new_item = form.save()
+        self.assertEqual(new_item, Item.objects.get())

src/apps/dashboard/views.py

@@ -22,7 +22,7 @@ def view_list(request, list_id):
     if request.method == "POST":
         form = ExistingListItemForm(for_list=our_list, data=request.POST)
         if form.is_valid():
-            form.save(for_list=our_list)
+            form.save()
             return redirect(our_list)
     return render(request, 'apps/dashboard/list.html', {'list': our_list, "form": form})