Add negated params filter to EpicsFinder

ee/app/finders/epics_finder.rb

@@ -55,16 +55,8 @@ class EpicsFinder < IssuableFinder
     return Epic.none unless Ability.allowed?(current_user, :read_epic, group)
 
     items = init_collection
-    items = by_created_at(items)
-    items = by_updated_at(items)
-    items = by_author(items)
-    items = by_timeframe(items)
-    items = by_state(items)
-    items = by_label(items)
-    items = by_parent(items)
-    items = by_iids(items)
-    items = starts_with_iid(items)
-    items = by_my_reaction_emoji(items)
+    items = filter_items(items)
+    items = filter_negated_items(items)
 
     # This has to be last as we use a CTE as an optimization fence
     # for counts by passing the force_cte param and enabling the
@@ -95,6 +87,30 @@ class EpicsFinder < IssuableFinder
 
   private
 
+  def filter_items(items)
+    items = by_created_at(items)
+    items = by_updated_at(items)
+    items = by_author(items)
+    items = by_timeframe(items)
+    items = by_state(items)
+    items = by_label(items)
+    items = by_parent(items)
+    items = by_iids(items)
+    items = by_my_reaction_emoji(items)
+
+    starts_with_iid(items)
+  end
+
+  def filter_negated_items(items)
+    return items unless Feature.enabled?(:not_issuable_queries, group, default_enabled: true)
+
+    # API endpoints send in `nil` values so we test if there are any non-nil
+    return items unless not_params&.values&.any?
+
+    items = by_negated_label(items)
+    by_negated_author(items)
+  end
+
   def group
     return unless params[:group_id]
     return @group if defined?(@group)

ee/changelogs/unreleased/212579-not-operator-not-functional-when-searching-epics.yml

+---
+title: Add negated params filter to epics search
+merge_request: 32296
+author:
+type: fixed

ee/spec/finders/epics_finder_spec.rb

@@ -355,6 +355,56 @@ describe EpicsFinder do
             end
           end
         end
+
+        context 'with negated labels' do
+          let_it_be(:label) { create(:label) }
+          let_it_be(:label2) { create(:label) }
+          let_it_be(:negated_epic) { create(:labeled_epic, group: group, labels: [label]) }
+          let_it_be(:negated_epic2) { create(:labeled_epic, group: group, labels: [label2]) }
+          let_it_be(:params) { { not: { label_name: [label.title, label2.title].join(',') } } }
+
+          it 'returns all epics if no negated labels are present' do
+            expect(epics).to contain_exactly(negated_epic, negated_epic2, epic1, epic2, epic3)
+          end
+
+          it 'returns all epics without negated label' do
+            expect(epics(params)).to contain_exactly(epic1, epic2, epic3)
+          end
+
+          context 'when not_issuable_queries is disabled' do
+            before do
+              stub_feature_flags(not_issuable_queries: false)
+            end
+
+            it 'returns epics that include negated params' do
+              expect(epics(params)).to contain_exactly(negated_epic, negated_epic2, epic1, epic2, epic3)
+            end
+          end
+        end
+
+        context 'with negated author' do
+          let_it_be(:author) { create(:user) }
+          let_it_be(:authored_epic) { create(:epic, group: group, author: author) }
+          let_it_be(:params) { { not: { author_id: author.id } } }
+
+          it 'returns all epics if no negated author is present' do
+            expect(epics).to contain_exactly(authored_epic, epic1, epic2, epic3)
+          end
+
+          it 'returns all epics without given author' do
+            expect(epics(params)).to contain_exactly(epic1, epic2, epic3)
+          end
+
+          context 'when not_issuable_queries is disabled' do
+            before do
+              stub_feature_flags(not_issuable_queries: false)
+            end
+
+            it 'returns epics that include negated params' do
+              expect(epics(params)).to contain_exactly(authored_epic, epic1, epic2, epic3)
+            end
+          end
+        end
       end
     end
   end