如何检查 activescaffold 中的新状态

Question

active_scaffold :formats do |config|
    format_order = Format.find(:all, :select => :format_order, :order => :format_order).collect(&:format_order)
    format_order << format_order.size + 1  # I want only implement when new
    config.columns = [:name, :format_order]
    config.columns[:format_order].form_ui = :select
    config.columns[:format_order].options = {
      :options => format_order
    }
    config.list.columns = [:name, :format_order]
  end

我希望如果我使用新格式，format_order 将添加一个数字作为代码 (format_order.size + 1)，但我不想实现它以进行编辑。请帮我。谢谢

Answer 1

你必须实现一个回调：

class Format < ActiveRecord::Base
...
  after_validation(:on => :create) do
    self.code = whatever_code_you_want_to_assign #
  end
...
end