Do not show hidden namespaces in destroy commnad help

railties/lib/rails/commands/destroy/destroy_command.rb

@@ -5,6 +5,9 @@ module Rails
     class DestroyCommand < Base # :nodoc:
       no_commands do
         def help
+          require_application_and_environment!
+          load_generators
+
           Rails::Generators.help self.class.command_name
         end
       end

railties/test/application/generators_test.rb

@@ -189,6 +189,9 @@ module ApplicationTests
       FileUtils.cd(rails_root) do
         output = `bin/rails generate --help`
         assert_no_match "active_record:migration", output
+
+        output = `bin/rails destroy --help`
+        assert_no_match "active_record:migration", output
       end
     end
   end