[EE Backport] Add notes filters for epics

doc/user/discussions/index.md

@@ -280,7 +280,7 @@ Additionally locked issues can not be reopened.
 For issues with many comments like activity notes and user comments, sometimes 
 finding useful information can be hard. There is a way to filter comments from single notes and discussions for merge requests and issues.  
 
-From a merge request's **Discussion** tab, or from an issue overview, find the filter's dropdown menu on the right side of the page, from which you can choose one of the following options:
+From a merge request's **Discussion** tab, or from an epic/issue overview, find the filter's dropdown menu on the right side of the page, from which you can choose one of the following options:
 
 - **Show all activity**: displays all user comments and system notes
 (issue updates, mentions from other issues, changes to the description, etc).

spec/controllers/projects/issues_controller_spec.rb

@@ -1131,6 +1131,7 @@ describe Projects::IssuesController do
 
       context 'when user is setting notes filters' do
         let(:issuable) { issue }
+        let(:issuable_parent) { project }
         let!(:discussion_note) { create(:discussion_note_on_issue, :system, noteable: issuable, project: project) }
 
         it_behaves_like 'issuable notes filter'

spec/controllers/projects/merge_requests_controller_spec.rb

@@ -78,6 +78,7 @@ describe Projects::MergeRequestsController do
 
     context 'when user is setting notes filters' do
       let(:issuable) { merge_request }
+      let(:issuable_parent) { project }
       let!(:discussion_note) { create(:discussion_note_on_merge_request, :system, noteable: issuable, project: project) }
       let!(:discussion_comment) { create(:discussion_note_on_merge_request, noteable: issuable, project: project) }
 

spec/support/shared_examples/controllers/issuable_notes_filter_shared_examples.rb

 shared_examples 'issuable notes filter' do
+  let(:params) do
+    if issuable_parent.is_a?(Project)
+      { namespace_id: issuable_parent.namespace, project_id: issuable_parent, id: issuable.iid }
+    else
+      { group_id: issuable_parent, id: issuable.to_param }
+    end
+  end
+
   it 'sets discussion filter' do
     notes_filter = UserPreference::NOTES_FILTERS[:only_comments]
 
-    get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid, notes_filter: notes_filter }
+    get :discussions, params: params.merge(notes_filter: notes_filter)
 
     expect(user.reload.notes_filter_for(issuable)).to eq(notes_filter)
     expect(UserPreference.count).to eq(1)
@@ -13,7 +21,7 @@ shared_examples 'issuable notes filter' do
 
     expect_any_instance_of(issuable.class).to receive(:expire_note_etag_cache)
 
-    get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid, notes_filter: notes_filter }
+    get :discussions, params: params.merge(notes_filter: notes_filter)
   end
 
   it 'does not expires notes e-tag cache for issuable if filter did not change' do
@@ -22,14 +30,14 @@ shared_examples 'issuable notes filter' do
 
     expect_any_instance_of(issuable.class).not_to receive(:expire_note_etag_cache)
 
-    get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid, notes_filter: notes_filter }
+    get :discussions, params: params.merge(notes_filter: notes_filter)
   end
 
   it 'does not set notes filter when database is in read only mode' do
     allow(Gitlab::Database).to receive(:read_only?).and_return(true)
     notes_filter = UserPreference::NOTES_FILTERS[:only_comments]
 
-    get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid, notes_filter: notes_filter }
+    get :discussions, params: params.merge(notes_filter: notes_filter)
 
     expect(user.reload.notes_filter_for(issuable)).to eq(0)
   end
@@ -37,7 +45,7 @@ shared_examples 'issuable notes filter' do
   it 'returns only user comments' do
     user.set_notes_filter(UserPreference::NOTES_FILTERS[:only_comments], issuable)
 
-    get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid }
+    get :discussions, params: params
     discussions = JSON.parse(response.body)
 
     expect(discussions.count).to eq(1)
@@ -47,7 +55,7 @@ shared_examples 'issuable notes filter' do
   it 'returns only activity notes' do
     user.set_notes_filter(UserPreference::NOTES_FILTERS[:only_activity], issuable)
 
-    get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid }
+    get :discussions, params: params
     discussions = JSON.parse(response.body)
 
     expect(discussions.count).to eq(1)
@@ -60,7 +68,7 @@ shared_examples 'issuable notes filter' do
 
       expect(ResourceEvents::MergeIntoNotesService).not_to receive(:new)
 
-      get :discussions, params: { namespace_id: project.namespace, project_id: project, id: issuable.iid }
+      get :discussions, params: params
     end
   end
 end