NoMethodError for relationship between models

I am setting up a relationship between two of my models. A Patient Model and Worklist Model. My patient can belong to a worklist and a worklist can have many patients. In my form for patients I want to be able to select the worklist from a dropdown menu. I created a method in the form but its throwing an error. Here is my code:

from _form.html.erb:

    <div class="field">
  <%= f.label :worklist_id %>
  <%= worklist_select( :patient, :worklist_id, Worklist.all, :id, :name, {}, {     :multiple => false } ) %>
</div>

from patient.rb:

class Patient < ActiveRecord::Base
  belongs_to :worklist
end

from worklist.rb

class Worklist < ActiveRecord::Base
  has_many :patients
end

from schema.rb

  create_table "patients", force: :cascade do |t|
    t.string   "lastname"
    t.string   "middlename"
    t.string   "firstname"
    t.date     "birthdate"
    t.string   "sex"
    t.string   "ethnicity"
    t.string   "uniqueid"
    t.string   "accountnumber"
    t.string   "medicaidid"
    t.string   "medicareid"
    t.string   "ssn"
    t.datetime "created_at",    null: false
    t.datetime "updated_at",    null: false
    t.integer  "worklist_id"
  end

And this is the error I am getting:

NoMethodError in Patients#edit
undefined method `worklist_select'