REST: Disable control for filtering patches by series in web view

As with the events view, creating and rendering the control for
filtering patches by series creates a massive slowdown. It's a little
sad not to be able to do this in the web UI as filtering patches
by series does make sense, but hopefully people figure out you can
still do it, just not from the web view.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Stephen Finucane <stephen@that.guru>

patchwork/api/filters.py

@@ -168,7 +168,10 @@ class Meta:
 class CoverLetterFilterSet(TimestampMixin, FilterSet):
 
     project = ProjectFilter(queryset=Project.objects.all())
-    series = BaseFilter(queryset=Project.objects.all())
+    # NOTE(stephenfin): We disable the select-based HTML widgets for these
+    # filters as the resulting query is _huge_
+    series = BaseFilter(queryset=Project.objects.all(),
+                        widget=MultipleHiddenInput)
     submitter = PersonFilter(queryset=Person.objects.all())
 
     class Meta:
@@ -179,7 +182,10 @@ class Meta:
 class PatchFilterSet(TimestampMixin, FilterSet):
 
     project = ProjectFilter(queryset=Project.objects.all())
-    series = BaseFilter(queryset=Series.objects.all())
+    # NOTE(stephenfin): We disable the select-based HTML widgets for these
+    # filters as the resulting query is _huge_
+    series = BaseFilter(queryset=Series.objects.all(),
+                        widget=MultipleHiddenInput)
     submitter = PersonFilter(queryset=Person.objects.all())
     delegate = UserFilter(queryset=User.objects.all())
     state = StateFilter(queryset=State.objects.all())