如何将值从控制器传递给模型？

class Task < ActiveRecord::Base
  has_many :notes, :as => :notable,  :dependent => :destroy
  has_many :work_times, :dependent => :destroy
end

class WorkTime < ActiveRecord::Base
  belongs_to :task
end


class NotesController < ApplicationController


      end
    end
####
class Task < ActiveRecord::Base
  has_many :not