Make sure project insights stick on its own

changelogs/unreleased/33337-fix-insights-only-projects-for-project.yml

+---
+title: Make sure project insights stick on its own
+merge_request: 18082
+author:
+type: fixed

ee/lib/gitlab/insights/finders/issuable_finder.rb

@@ -31,6 +31,8 @@ module Gitlab
 
         # Returns an Active Record relation of issuables.
         def find
+          return unless entity_args
+
           relation = finder
             .new(current_user, finder_args)
             .execute
@@ -69,23 +71,24 @@ module Gitlab
             state: query[:issuable_state] || 'opened',
             label_name: query[:filter_labels],
             sort: 'created_asc',
-            created_after: created_after_argument,
-            projects: finder_projects
-          }.merge(entity_arg)
+            created_after: created_after_argument
+          }.merge(entity_args)
         end
 
-        def entity_arg
-          case entity
-          when ::Project
-            if finder_projects
-              {} # We just rely on projects argument
+        def entity_args
+          strong_memoize(:entity_args) do
+            case entity
+            when ::Project
+              if finder_projects
+                { project_id: entity.id } if finder_projects.exists?(entity.id) # rubocop: disable CodeReuse/ActiveRecord
+              else
+                { project_id: entity.id }
+              end
+            when ::Namespace
+              { group_id: entity.id, projects: finder_projects }
             else
-              { project_id: entity.id }
+              raise InvalidEntityError, "Entity class `#{entity.class}` is not supported. Supported classes are Project and Namespace!"
             end
-          when ::Namespace
-            { group_id: entity.id }
-          else
-            raise InvalidEntityError, "Entity class `#{entity.class}` is not supported. Supported classes are Project and Namespace!"
           end
         end
 

ee/spec/lib/gitlab/insights/finders/issuable_finder_spec.rb

@@ -170,9 +170,14 @@ RSpec.describe Gitlab::Insights::Finders::IssuableFinder do
         context 'when `projects.only` are specified by two ids' do
           let(:projects) { { only: [project.id, other_project.id] } }
 
-          it 'returns issuables for all projects' do
-            expect(subject.to_a)
-              .to eq([issuable0, issuable1, issuable2, issuable3, issuable4])
+          it 'returns issuables for all valid projects' do
+            expected = [issuable0, issuable1, issuable2, issuable3, issuable4]
+
+            if entity.id == project.id
+              expected.shift(2) # Those are from other_project
+            end
+
+            expect(subject.to_a).to eq(expected)
           end
         end
 
@@ -185,10 +190,10 @@ RSpec.describe Gitlab::Insights::Finders::IssuableFinder do
         end
 
         context 'when `projects.only` are specified by bad id and good id' do
-          let(:projects) { { only: [0, other_project.id] } }
+          let(:projects) { { only: [0, project.id] } }
 
           it 'returns issuables for good project' do
-            expect(subject.to_a).to eq([issuable0, issuable1])
+            expect(subject.to_a).to eq([issuable2, issuable3, issuable4])
           end
         end
 
@@ -203,9 +208,22 @@ RSpec.describe Gitlab::Insights::Finders::IssuableFinder do
         context 'when `projects.only` are specified by project full path and id' do
           let(:projects) { { only: [project.id, other_project.full_path] } }
 
-          it 'returns issuables for all projects' do
-            expect(subject.to_a)
-              .to eq([issuable0, issuable1, issuable2, issuable3, issuable4])
+          it 'returns issuables for all valid projects' do
+            expected = [issuable0, issuable1, issuable2, issuable3, issuable4]
+
+            if entity.id == project.id
+              expected.shift(2) # Those are from other_project
+            end
+
+            expect(subject.to_a).to eq(expected)
+          end
+        end
+
+        context 'when `projects.only` are specified by duplicated projects' do
+          let(:projects) { { only: [project.id, project.full_path] } }
+
+          it 'returns issuables for that project without duplicated issuables' do
+            expect(subject.to_a).to eq([issuable2, issuable3, issuable4])
           end
         end
 
@@ -216,6 +234,14 @@ RSpec.describe Gitlab::Insights::Finders::IssuableFinder do
             expect(subject.to_a).to be_empty
           end
         end
+
+        context 'when `projects.only` are specified by unrelated project' do
+          let(:projects) { { only: [create(:project, :public).id] } }
+
+          it 'returns nothing' do
+            expect(subject.to_a).to be_empty
+          end
+        end
       end
     end