def create
    @product = Product.find_by(id: params[:product_id])
    @order = @product.transactions.new(order_params)
    @order.user_id = current_user.id
    @order.mode = "ORDER"
    @order.quantity = @order.quantity * -1

    if @product.save
   	 redirect_to product_path(@product), notice: "Order has been added."
    else
   	 render 'new'
    end
end