Hide ancestor groups in the share group dropdown list

app/controllers/projects/settings/members_controller.rb

@@ -9,6 +9,7 @@ module Projects
 
         @skip_groups = @group_links.pluck(:group_id)
         @skip_groups << @project.namespace_id unless @project.personal?
+        @skip_groups += @project.group.ancestors.pluck(:id) if @project.group
 
         @project_members = MembersFinder.new(@project, current_user).execute
 

app/models/group.rb

@@ -207,7 +207,7 @@ class Group < Namespace
   end
 
   def members_with_parents
-    GroupMember.non_request.where(source_id: ancestors.map(&:id).push(id))
+    GroupMember.non_request.where(source_id: ancestors.pluck(:id).push(id))
   end
 
   def users_with_parents

changelogs/unreleased/dz-hide-share-group-ancestors.yml

+---
+title: Hide ancestor groups in the share group dropdown list
+merge_request: 9965
+author:

spec/features/projects/group_links_spec.rb

@@ -8,7 +8,7 @@ feature 'Project group links', feature: true, js: true do
   let!(:group) { create(:group) }
 
   background do
-    project.team << [master, :master]
+    project.add_master(master)
     login_as(master)
   end
 
@@ -29,4 +29,26 @@ feature 'Project group links', feature: true, js: true do
       end
     end
   end
+
+  context 'nested group project' do
+    let!(:nested_group) { create(:group, parent: group) }
+    let!(:another_group) { create(:group) }
+    let!(:project) { create(:project, namespace: nested_group) }
+
+    background do
+      group.add_master(master)
+      another_group.add_master(master)
+    end
+
+    it 'does not show ancestors' do
+      visit namespace_project_settings_members_path(project.namespace, project)
+
+      click_link 'Search for a group'
+
+      page.within '.select2-drop' do
+        expect(page).to have_content(another_group.name)
+        expect(page).not_to have_content(group.name)
+      end
+    end
+  end
 end