I wonder if this would be best captured in a configuration value? 

http://railscasts.com/episodes/85-yaml-configuration-file

Then the code doesn't have to change in future updates to the roles
YAML:
```yml
allowed_roles: [ admin, designer, super_user ]
```

..then in this method:
```ruby
user.roles.each do |role|
return true if APP_CONFIG['allowed_roles'].contains? 
```