def update_cart_item
    @product         = Product.find params[ :product_id ]
    product_color    = ProductColor.find params[ :product_color ][ :product_id ]
    product_size     = ProductSize.find params[ :product_size ][ :product_id ]
    product_quantity = ProductQuantity.find params[ :product_quantity ][ :product_id ]
    product_price    = ProductPrice.first( :conditions => {
      :product_color_id => product_color.id,
      :product_quantity_id => product_quantity.id,
      :product_size_id => product_size.id
    } )
    product_customs  = []
    product_size.product_customs.all.each do |product_custom|
      value = params[ 'product_custom_' + product_custom.id.to_s ]
      product_customs << ProductCustomItem.find( value ) if value
    end
    page_count = params[ :page_count ]
    if page_count && ( page_count == "" )
      page_count = 2 # nil - changed to 2 on 05/05/2009
    else
      page_count = page_count.to_i if page_count
    end

    source_was_valid = cart_item.source_diagnostics.nil?
    @old_proof       = cart_item.proof
    cart_item.change_product product_price, product_customs, page_count
    @valid_source = cart_item.source_diagnostics.nil?
    @proof        = cart_item.proof

    set_od_for_lists

    @cart_item = cart_item
    render :update do |page|
      unless @cart_item.valid_product?
        page.replace_html 'artworks',
          :text => "The database is not yet adjusted for this product"
        # render :text => "The database is not yet adjusted for this product"
      else
        @cover_part   = @cart_item.cover
        @content_part = @cart_item.content
        @product_node = ProductNode.find @cart_item.product_node_id
        page.replace_html 'content_upload_list', :partial => 'source_list',
          :locals => { :product_part => @content_part, :output_hash => @output_hash }
      end
      old_proof_status = ! @old_proof.nil?
      new_proof_status = ! @proof.nil?
      if old_proof_status != new_proof_status
        @can_make_proof = @cart_item.acceptable_by_odt?
        page.replace_html 'proof_status', :partial => 'proof'
      end
      @project = Project.find(@cart_item.project_id) rescue nil
      if @valid_source != source_was_valid
        page.replace_html 'final_buttons', :partial => 'final_buttons'
      end
    end