Rails3：在多模型表单中显示验证错误？

Question

是否可以创建这种带有显示错误的表单，如简单模型？ http://i.imgur.com/8t6ef.png

我创建了两个模型...但是如果我填写错误的表格...不会出现错误消息并且错误 Rails 屏幕会告诉我，例如“验证失败：字段 1 不能为空... "

http://i.imgur.com/6KvVh.png

型号：

class Step < ActiveRecord::Base

  #validates
  validates :tree_id, :presence => true, :numericality => true
  validates :is_first, :presence => true, :length => {:maximum => 1}
  validates :status, :presence => true, :numericality => true
  validates :step_type_id, :presence => true

  #relations
  belongs_to :step_type
  belongs_to :tree
  has_many :statements

  accepts_nested_attributes_for :statements 

end

class Statement < ActiveRecord::Base

  #validates
  validates :step_id, :presence => true, :numericality => true
  validates :title, :presence => true, :length => {:maximum => 255}
  validates :statement, :presence => true
  validates :help, :presence => true
  validates :is_last_version, :presence => true, :length => {:maximum => 1}


  #relations
  belongs_to :step
  has_many :transitions

end

有什么例子或建议吗？

Answer 1

你的观点中有以下几行吗？

<% if @statement.errors.any? %>
  <% flash[:notice] = "Please correct!" %>

    <% for message in @statement.errors.full_messages %>
        <li class="cf-messages-li"><%= message %></li>
    <% end %>

<% end %>