McGinTech

> script/plugin source http://svn.techno-weenie.net/projects/plugins
> script/plugin install acts_as_attachment
> rake test_plugins PLUGIN=acts_as_attachment

> script/generate model dvd
> script/generate attachment_model dvd_cover

   create_table :dvd do |t|
      t.column "name", :string
      t.column "studio", :string
      t.column "producer", :string
    end

   create_table :dvd_covers do |t|
      t.column "dvd_id", :integer
      t.column "content_type", :string
      t.column "filename", :string
      t.column "size", :integer

      # The following fields are not mandatory.
      t.column "parent_id",  :integer
      t.column "thumbnail", :string
      t.column "width", :integer
      t.column "height", :integer
    end

class Dvd < ActiveRecord::Base
  has_one :dvd_cover
end

class DvdCover < ActiveRecord::Base
  belongs_to :dvd
  acts_as_attachment :storage => :file_system
  validates_as_attachment
end

class DvdController < ApplicationController

  def index
    @dvd = Dvd.find(:all)
  end

  def new_dvd
    @dvd = params[:id].nil? ? Dvd.new : Dvd.find(params[:id])
    @dvd_cover = DvdCover.new(params[:dvd_cover])

    if request.post?
      @dvd.attributes = params[:dvd]
      @dvd_cover.attributes = params[:dvd_cover]

      def save_dvd
        Dvd.transaction do
          @dvd.save!
          @dvd_cover.dvd_id = @dvd.id
          @dvd_cover.save!
        end
      end

      redirect_to(:action => "index") and return if save_dvd
    end
  rescue ActiveRecord::RecordInvalid
  end

end

<%= error_messages_for :dvd %>
<%= error_messages_for :dvd_cover %>

<%= form_tag({:action => "new_dvd"}, { :multipart=>true }) %>

<label for="name"><strong>Name:</strong></label>

<%= text_field("dvd", "name", "size" => 50, "maxlength" => 50) %>

<label for="name"><strong>Studio:</strong></label>

<%= text_field("dvd", "studio", "size" => 50, "maxlength" => 50) %>

<label for="name"><strong>Producer:</strong></label>

<%= text_field("dvd", "producer", "size" => 50, "maxlength" => 50) %>

<label for="name"><strong>DVD Cover:</strong></label>

<%= file_field("dvd_cover", "uploaded_data") %>

<%= submit_tag ‘Create DVD’ %>

<%= end_form_tag %>