FIX: doesn't translate group permission keys

app/serializers/tag_group_serializer.rb

@@ -12,12 +12,14 @@ class TagGroupSerializer < ApplicationSerializer
   def permissions
     @permissions ||= begin
       h = {}
-      object.tag_group_permissions.joins(:group).includes(:group).order("groups.name").each do |tgp|
-        h[tgp.group.name] = tgp.permission_type
-      end
-      if h.size == 0
-        h['everyone'] = TagGroupPermission.permission_types[:full]
+
+      object.tag_group_permissions.joins(:group).includes(:group).find_each do |tgp|
+        name = Group::AUTO_GROUP_IDS.fetch(tgp.group_id, tgp.group.name).to_s
+        h[name] = tgp.permission_type
       end
+
+      h["everyone"] = TagGroupPermission.permission_types[:full] if h.empty?
+
       h
     end
   end

spec/serializers/tag_group_serializer_spec.rb

@@ -0,0 +1,21 @@
+require "rails_helper"
+
+describe TagGroupSerializer do
+
+  it "doesn't translate automatic group names in permissions" do
+    staff_group = Group.find(Group::AUTO_GROUPS[:staff])
+    staff_group.update_columns(name: "custom")
+
+    tag_group = Fabricate(:tag_group)
+    tag_group.permissions = [[
+      Group::AUTO_GROUPS[:staff],
+      TagGroupPermission.permission_types[:full]
+    ]]
+    tag_group.save!
+
+    serialized = TagGroupSerializer.new(tag_group, root: false).as_json
+
+    expect(serialized[:permissions].keys).to contain_exactly("staff")
+  end
+
+end