How to Kill threads that are present in Controller in its model (Ruby 2.1.2 on Rails 3.2.13)

I have a controller RamsController in that I have this method

def check_status
   @ram = Ram.find(params[:id])
   if @ram.workflow == "start"
      thread_check_status = Thread.new do
         thread.current[:name] = "thread_manual_traige"
         @ram.check_status!
         ActiveRecord::Base.connection.close
      end
      @ram.thread_check_status = thread_check_status
   end
  render json: { status: "success" }
end

I have a model code like this

class Ram < ActiveRecord::Base

attr_accessor :thread_check_status 

  def self.kill_threads
    self.thread_check_status.kill
  end

  def exception_handler(exception)
   if exception == "exited by user"
     self.kill_threads
   end
  end

Whenever an exception is caught it will go to the exception_handler method in the model. And now, I'm trying to kill the thread when the exception is caught so I tried to assign the thread to the variable @ram.thread_check_status = thread_check_status So I created a method def self.kill_threads in the model to kill the threads and called that method in def excpetion_handle method.

But, it is not working I think I assigned the thread to the variable in a wrong way @ram.thread_check_status = thread_check_status

Please suggest me how to kill the threads associated with @ram id in the model.

And I have two more methods in RamsController with two more threads and I'm trying kill those threads too.