Ruby on Rails

I have a Course model which habtm categories. I am trying to have checkboxes to add or delete categories from the new and update courses pages.

Models:

course.rb

# == Schema Information

#

# Table name: courses

#

#  id                     :integer          not null, primary key

#  course_number          :integer

#  partner                :string(255)

#  title                  :string(255)

#  length                 :integer

#  includes_certification :boolean

#  overview               :text

#  price                  :integer

#  created_at             :datetime

#  updated_at             :datetime

#  more_link              :string(255)

#

class Course < ActiveRecord::Base

  self.per_page = 8

  has_and_belongs_to_many :course_dates

  has_and_belongs_to_many :categories

  attr_accessible :course_number, :partner, :title, :length, :includes_certification, :overview, :more_link, :price, :tags, :course_dates_attributes, :categories_attributes

  accepts_nested_attributes_for :course_dates, allow_destroy: true

  accepts_nested_attributes_for :categories, allow_destroy: true

end

category.rb

# == Schema Information

#

# Table name: categories

#

#  id            :integer          not null, primary key

#  name          :string(255)

#  created_at    :datetime

#  updated_at    :datetime

#

class Category < ActiveRecord::Base

  has_and_belongs_to_many :courses

  attr_accessible :name

end

My form is being built from this partial:

= simple_form_for(@course) do |f|

  = f.error_notification

  .form-inputs

    = f.input :course_number

    = f.input :partner

    = f.input :title

    = f.input :length

    = f.fields_for :course_dates do |builder|

      = render 'course_date_fields', f: builder

    = link_to_add_fields "Add Date", f, :course_dates

    = f.input :includes_certification

    = f.input :overview

    = f.input :more_link

    = hidden_field_tag "course[category_ids][]", nil

    - Category.all.each do |category|

      = check_box_tag "course[category_ids][]", category.id, @course.category_ids.include?(category.id), id: dom_id(category)

      = label_tag dom_id(category), category.name

    = f.input :price

  .form-actions

    = f.button :submit

I tried using simple_form's f.association as: :check_boxes and also the f.collection_check_boxes but both end in the same problem. I can see the checkboxes but when I click update it doesn't save the categories I checked or unchecked.

I have been trying to figure out why, figured it was a problem with mass assignment but I don't know what else I can do with attr_accessible to make it work.

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