1 files changed, 31 insertions, 0 deletions
diff --git a/app/services/groups/participants_service.rb b/app/services/groups/participants_service.rb
new file mode 100644
index 00000000000..0844c98dd6a
--- /dev/null
+++ b/app/services/groups/participants_service.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+module Groups
+  class ParticipantsService < Groups::BaseService
+    include Users::ParticipableService
+
+    def execute(noteable)
+      @noteable = noteable
+
+      participants =
+        noteable_owner +
+        participants_in_noteable +
+        all_members +
+        groups +
+        group_members
+
+      render_participants_as_hash(participants.uniq)
+    end
+
+    def all_members
+      count = group_members.count
+      [{ username: "all", name: "All Group Members", count: count }]
+    end
+
+    def group_members
+      return [] unless noteable
+
+      @group_members ||= sorted(noteable.group.direct_and_indirect_users)
+    end
+  end
+end