Question about symbols

I want to organize model-classes into subdirectories. I’ve create new
model Security::User (with script/generate model security/User). Class
and directory has been created successfully.
Then I want to create a controller admin/security/user (script/
generate controller admin/security/user). All looks ok.
But then I want to create a scaffold (scaffold :User - something like
How should I do it in my situation?