Rails - Dec 2007 - How to set virtual attributes while saving multiple models?

i need to let the user choose a few optional parameters through
checkboxes, that when one is checked for example, will do this on the
Upload model:

@thumbs.update :Small => ''600x800>''


and if another checkbox is checked, may do this

@thumbs.update :Large => ''1280x1024>''


here is my form
# new.rhtml
<h1>Upload Photo</h1>
<% form_for(:photo, :url => {:action => "create_upload"},
:html =>{
:multipart => true }) do |form| %>
    <p>
        Title:
        <br />
        <%= form.text_field :title %>
    </p>
    <p>
        Image:
        <br />
        <% fields_for "photo[upload_attributes][]",
@photo.uploads[0] do
|data_form| -%>
            <%= data_form.file_field :uploaded_data %>
        <% end -%>
    </p>
    <p>
        <%= submit_tag "Upload Photo" %>
    </p>
<% end %>

here are my models and controllers

# photo.rb
class Photo < ActiveRecord::Base

  has_many :uploads
  belongs_to :user

  def upload_attributes=(upload_attributes)
    upload_attributes.each do |attributes|
      uploads.build(attributes)
    end
  end
end


# upload.rb
class Upload < ActiveRecord::Base
  belongs_to :photo

  @thumbs = { :thumb => ''124x143>'' }

  has_attachment :content_type => :image,
                 :storage => :file_system,
                 :max_size => 5000.kilobytes,
                 :thumbnails => @thumbs

  validates_as_attachment

end



# photos_controller.rb

def new
    @photo = Photo.new
    @photo.uploads.build
end

def create
    @photo = Photo.new(params[:photo])
    @photo.user_id = @user.id

    if @photo.save
      flash[:notice] = ''Photo was successfully uploaded.''
      redirect_to :action => :gallery
    else
      flash[:notice] = ''Photo failed to upload.''
      render :action => :upload
    end
end



can you please tell me how to add these key=>values to the @thumbs so a
user can choose what sized images will be generated through a form like
this:

# new.rhtml
<h1>Upload Photo</h1>
<% form_for(:photo, :url => {:action => "create_upload"},
:html => {
:multipart => true }) do |form| %>
    <p>
      Title:<br />
      <%= form.text_field :title %>
    </p>

    <p>
      Image:<br />
      <% fields_for "photo[upload_attributes][]", @photo.uploads[0]
do
|data_form| -%>
          <%= data_form.file_field :uploaded_data %>

    <% end -%>
      <ul>
        <li><%= form.check_box :XSmall %></li>
        <li><%= form.check_box :Small %></li>
        <li><%= form.check_box :Medium %></li>
        <li><%= form.check_box :Large %></li>
      </ul>
    </p>

    <p>
      <%= submit_tag "Upload Photo" %>
    </p>
  <% end %>



or maybe this

#new.rhtml
<h1>Upload Photo</h1>
<% form_for(:photo, :url => {:action => "create_upload"},
:html => {
:multipart => true }) do |form| %>
    <p>
      Title:<br />
      <%= form.text_field :title %>
    </p>

    <p>
      Image:<br />
      <% fields_for "photo[upload_attributes][]", @photo.uploads[0]
do
|data_form| -%>
          <%= data_form.file_field :uploaded_data %>
    <ul>
      <li><%= data_form.check_box :XSmall %></li>
      <li><%= data_form.check_box :Small %></li>
      <li><%= data_form.check_box :Medium %></li>
      <li><%= data_form.check_box :Large %></li>
    </ul>
    <% end -%>

    </p>

    <p>
      <%= submit_tag "Upload Photo" %>
    </p>
  <% end %>



any help would be appreciated, thanks in advance.
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