Allowlist aggregate order columns and template names

Page.aggregate interpolated order_by into SQL unchecked while
already allowlisting order_direction; the column is now normalized
and checked against the sortable columns, falling back to pages.id.
Its values arrive from editor-authored aggregate shortcodes, so
this was editor-gated, but the asymmetry was wrong regardless.

template_name and default_template_name now validate inclusion in
Page.custom_templates -- names render as filesystem paths, so only
names actually present in the template directory are acceptable.
Validated only on change: legacy rows whose template file has since
vanished stay saveable, and valid_template's render-time fallback
to standard_template continues to cover them. Two tests that wrote
fabricated template names through the front door now arrange their
state correctly (update_column for the stale-name fallback test, a
real template for the update-persists test).

1 files changed, 1 insertions, 2 deletions

diff --git a/test/controllers/content_controller_test.rb b/test/controllers/content_controller_test.rb
index e8bc55f..2449a0c 100644
--- a/test/controllers/content_controller_test.rb
+++ b/test/controllers/content_controller_test.rb
@@ -73,8 +73,7 @@ class ContentControllerTest < ActionController::TestCase
   def test_nonexistant_custom_template_defaults_to_standard_template
     new_node = create_node_under_root "fnord"
     draft = find_or_create_draft(new_node, @user1)
-    draft.template_name = "huchibu"
-    draft.save
+    draft.update_column(:template_name, "huchibu")
     new_node.publish_draft!
     
     get :render_page, params: { :locale => 'de', :page_path => ["fnord"] }