How do I sort an Array with coffeescript?

with an Array like this:

users = [ 
   { id: 1, fname: 'Fred', lname: 'Flinstone', state: 'CA' }, 
   { id: 2, fname: 'George', lname: 'Winston', state: 'FL' },
   { id: 3, fname: 'Luke', lname: 'Skywalker', state: 'CA' }
]

and you want to sort by last name with coffeescript, you can do this:

users.sort (a,b) ->
  return if a.lname.toUpperCase() >= b.lname.toUpperCase() then 1 else -1

I tried using a function like this:

sortBy = (field, reverse, primer) ->
    key = (x) ->
      return if primer? then primer x[field] else x[field]
    return (a,b) ->
      A = key a
      B = key b
      return (A < B ? -1 : (A > B ? 1 : 0)) * [1,-1][+!!reverse]

which was invoked like this:

users.sort sortBy "lname", false, (a) -> 
  return a.toUpperCase()

but that didn't sort the array properly.

Is there a way to sort by more than 1 field, i.e. sort first by State, and then by Last Name? I was hoping to improve upon the "sortBy" function above and add ability to sort by at least 2 fields.