Rails have many polymorphic flags

Question

It really turns me on! :(

I am trying to create a nested model model for my User model, having a list of flags in it, where several stores can be checked or unchecked to administer the repositories through the model.

class Staffing < ActiveRecord::Base
  # Associations
  belongs_to :user
  belongs_to :staffable, :polymorphic => true
  belongs_to :store,     :class_name => "Store",
                         :foreign_key => "staffable_id"
end

class User < ActiveRecord::Base
  # Includes
  acts_as_authentic

  # Associations
  has_many :staffings, :dependent => :destroy
  has_many :stores, :through => :staffings

  # Nested Attributes
  accepts_nested_attributes_for :staffings, :allow_destroy => true
end

class Store < ActiveRecord::Base
  # Associations
  has_many :staffings, :as => :staffable, :dependent => :destroy
  has_many :users, :through => :staffings
end


# Users Controller
def create
  @user = User.new(params[:user])
  flash.now[:notice] = "#{@user.name} was successfully created." if @user.save
  respond_with @user
end


def update
  @user = User.find(params[:id])
  params[:user][:store_ids] ||= []
  @user.update_attributes(params[:user])
  flash.now[:notice] = "#{@user.name} was successfully updated."
  respond_with @user
end

For purposes that may be ignored, another personal association may be ignored. This is a similar model that I ultimately want to administer with the Store, but first at first, since I'm as dumb as possible.

# User Form
- for store in Store.all
  %p
    = check_box_tag "user[store_ids][]", store.id, @user.stores.include?(store)
    = store.nickname

Sends my parameters as such:

{"utf8"=>"✓",
 "authenticity_token"=>"blub-blub-blub=",
 "user"=>{"login"=>"hey.buddy",
 "email"=>"[e-mail]",
 "role"=>"admin",
 "hq"=>"1",
 "password"=>"[FILTERED]",
 "password_confirmation"=>"[FILTERED]",
 "store_ids"=>["3",
 "4"]}}

And then ERROR!

Mysql2::Error: Column 'staffable_type' cannot be null: INSERT INTO `staffings` (`created_at`, `staffable_id`, `staffable_type`, `updated_at`, `user_id`) VALUES ('2010-11-17 00:30:24', 3, NULL, '2010-11-17 00:30:24', 102)

I know that I need to create staffable_type as a "Store", but I tried all day - what's the trick?

staffable_type ( id), : null = > false, , , DB .

create:

@user.staffings.each do |s|
  s.staffable_type = 'Store'
end

@user.store_ids.each do |i|
  s = @user.staffings.build
  s.staffable_type = 'Store'
  s.staffable_id = i
end

, , . .

!

Answer 1

, . , , , - -, , .

" ", "_ids", , .

. : http://paulbarry.com/articles/2007/10/24/has_many-through-checkboxes

, , , , - , , - !

, Paul , , , ( polymorphic_type):

attr_accessor :store_ids
after_save :update_stores

#after_save callback to handle group_ids
def update_stores
  unless store_ids.nil?
    self.staffings.each do |staffing|
      staffing.destroy unless store_ids.include?(staffing.staffable_id.to_s)
      store_ids.delete(staffing.staffable_id.to_s)
    end 
    store_ids.each do |s|
      self.staffings.create(attributes = {:staffable_id => s, :staffable_type => 'Store'}) unless s.blank?
    end
    reload
    self.store_ids = nil
  end
end