[EE] Support additional LabelsFinder parameters for group labels

app/controllers/concerns/issuable_collections.rb

@@ -17,7 +17,7 @@ module IssuableCollections
     set_pagination
     return if redirect_out_of_range(@total_pages)
 
-    if params[:label_name].present?
+    if params[:label_name].present? && @project
       labels_params = { project_id: @project.id, title: params[:label_name] }
       @labels = LabelsFinder.new(current_user, labels_params).execute
     end

app/controllers/groups/labels_controller.rb

@@ -14,12 +14,13 @@ class Groups::LabelsController < Groups::ApplicationController
       end
 
       format.json do
-        available_labels =
-          if params[:only_group_labels]
-            group.labels
-          else
-            LabelsFinder.new(current_user, group_id: @group.id).execute
-          end
+        available_labels = LabelsFinder.new(
+          current_user,
+          group_id: @group.id,
+          only_group_labels: params[:only_group_labels],
+          include_ancestor_groups: params[:include_ancestor_groups],
+          include_descendant_groups: params[:include_descendant_groups]
+        ).execute
 
         render json: LabelSerializer.new.represent_appearance(available_labels)
       end

app/finders/labels_finder.rb

@@ -61,12 +61,20 @@ class LabelsFinder < UnionFinder
 
   def group_ids
     strong_memoize(:group_ids) do
-      group = Group.find(params[:group_id])
-      groups = params[:include_ancestor_groups].present? ? group.self_and_ancestors : [group]
-      groups_user_can_read_labels(groups).map(&:id)
+      groups_user_can_read_labels(groups_to_include).map(&:id)
     end
   end
 
+  def groups_to_include
+    group = Group.find(params[:group_id])
+    groups = [group]
+
+    groups += group.ancestors if params[:include_ancestor_groups].present?
+    groups += group.descendants if params[:include_descendant_groups].present?
+
+    groups
+  end
+
   def group?
     params[:group_id].present?
   end

ee/spec/controllers/groups/epics_controller_spec.rb

@@ -113,6 +113,18 @@ describe Groups::EpicsController do
           expect(item['end_date']).to eq(epic.end_date)
           expect(item['web_url']).to eq(group_epic_path(group, epic))
         end
+
+        context 'using label_name filter' do
+          let(:label) { create(:label) }
+          let!(:labeled_epic) { create(:labeled_epic, group: group, labels: [label]) }
+
+          it 'returns all epics with given label' do
+            get :index, group_id: group, label_name: label.title, format: :json
+
+            expect(json_response.size).to eq(1)
+            expect(json_response.first['id']).to eq(labeled_epic.id)
+          end
+        end
       end
     end
 

spec/controllers/groups/labels_controller_spec.rb

 require 'spec_helper'
 
 describe Groups::LabelsController do
-  let(:group) { create(:group) }
-  let(:user)  { create(:user) }
+  set(:group) { create(:group) }
+  set(:user)  { create(:user) }
+  set(:project) { create(:project, namespace: group) }
 
   before do
     group.add_owner(user)
@@ -10,6 +11,34 @@ describe Groups::LabelsController do
     sign_in(user)
   end
 
+  describe 'GET #index' do
+    set(:label_1) { create(:label, project: project, title: 'label_1') }
+    set(:group_label_1) { create(:group_label, group: group, title: 'group_label_1') }
+
+    it 'returns group and project labels by default' do
+      get :index, group_id: group, format: :json
+
+      label_ids = json_response.map {|label| label['title']}
+      expect(label_ids).to match_array([label_1.title, group_label_1.title])
+    end
+
+    context 'with ancestor group', :nested_groups do
+      set(:subgroup) { create(:group, parent: group) }
+      set(:subgroup_label_1) { create(:group_label, group: subgroup, title: 'subgroup_label_1') }
+
+      before do
+        subgroup.add_owner(user)
+      end
+
+      it 'returns ancestor group labels', :nested_groups do
+        get :index, group_id: subgroup, include_ancestor_groups: true, only_group_labels: true, format: :json
+
+        label_ids = json_response.map {|label| label['title']}
+        expect(label_ids).to match_array([group_label_1.title, subgroup_label_1.title])
+      end
+    end
+  end
+
   describe 'POST #toggle_subscription' do
     it 'allows user to toggle subscription on group labels' do
       label = create(:group_label, group: group)

spec/finders/labels_finder_spec.rb

@@ -89,6 +89,25 @@ describe LabelsFinder do
           expect(finder.execute).to eq [private_subgroup_label_1]
         end
       end
+
+      context 'when including labels from group descendants', :nested_groups do
+        it 'returns labels from group and its descendants' do
+          private_group_1.add_developer(user)
+          private_subgroup_1.add_developer(user)
+
+          finder = described_class.new(user, group_id: private_group_1.id, only_group_labels: true, include_descendant_groups: true)
+
+          expect(finder.execute).to eq [private_group_label_1, private_subgroup_label_1]
+        end
+
+        it 'ignores labels from groups which user can not read' do
+          private_subgroup_1.add_developer(user)
+
+          finder = described_class.new(user, group_id: private_group_1.id, only_group_labels: true, include_descendant_groups: true)
+
+          expect(finder.execute).to eq [private_subgroup_label_1]
+        end
+      end
     end
 
     context 'filtering by project_id' do