Jade: how does one assign the 'checked' attribute to dynamically generated radio button inputs?

I'm using Jade templates in an edit view where I edit a user's details, and a dynamically generated radio button like so (comes from my mongodb):

li Role:
      br
      label Subscriber
      input(type="radio", name="user[role]", val="subscriber")
      br
      label Admin
      input(type="radio", name="user[role]", val="admin")
      br
      label Super Admin
      input(type="radio", name="user[role]", val="superadmin")

How do I set one to checked dynamically?

So if in my db, my role is subscriber , how do I check for that? "Normally", I would do a if(user.role == 'subscriber'){'checked'} and so on for all of the different values.

Where/how does that logic go into this bit of Jade?