How to write a method trailing with a keyword

I have a situation where i need to call something like this :

class Office
   attr_accessor :workers, :id

   def initialize
      @workers = []
   end

   def workers<<(worker)
      type = worker.type
      resp = Organiation::Worker.post("/office/#{@id}/workers.json", :worker => {:type => type})
   end
end

this is where i need to call

office = Office.new()

new_worker = Worker.new()

office.workers << new_worker

how should i modify the above workers method in order to implement above code.