Question

当我提交具有两个模型的嵌套表单时，我收到500内部服务器错误 - Member和ChildrenInformation。

错误：

500内部服务器错误

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我检查了日志文件，这是我发现的：

TypeError（param`child_info_attrib'的预期Hash（获取数组））：

以下是我的铁路项目的其他部分

查看（new.html.erb＆gt;

  <%= form_for(@member) do |f| %>
 <div class="field">
    <%= f.label :gender, "Gender" %><br />
    <%= f.select :gender, options_for_select(["Male", "Female"]) %>
  </div>
 <div class="field">
    <%= f.label :fname, "First Name" %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :age, "Age" %><br />
    <%= f.text_field :age %>
  </div>
   <div class="field">
    <%= f.label :membership_id, "Membership ID" %>
    <%= f.text_field :membership_id %>
  </div>
  <div class="field">
    <%= f.label "Branch" %>
    <%= f.collection_select(:branch_id, Branch.all, :id, :name) %>
  </div>
  <% for children_information in @member.children_informations %>
     <%= fields_for "member[child_info_attrib][]", children_information do |children_info_form| %>
      <div class="field">
        <%= children_info_form.label :name, "Name" %><br />
        <%= children_info_form.text_field :name %>
      </div>
      <div class="field">
        <%= children_info_form.label :gender, "Gender" %><br />
        <%= children_info_form.select :gender, options_for_select(["Male", "Female"]) %>
      </div>
      <div class="field">
        <%= children_info_form.label :birthdate, "Birthdate" %><br />
     nn <%= children_info_form.datetime_select :birthdate, :discard_hour => true, 
:order => [:month, :day, :year], :start_year => 1900 %>
        </div>
   </div>
       <% end %>
    <% end %>`

模特（会员）

 class Member < ActiveRecord::Base
    has_many :children_informations

    def child_info_attrib=(attribs)
        attribs.each do |attrib|
          children_informations.build(attrib)
        end
    end 
 end

模型（儿童信息）

class ChildrenInformation < ActiveRecord::Base
    belongs_to :member
end

控制器（MembersController）

class MembersController < ApplicationController
def new
    @member = Member.new
    @member.children_informations.build

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @member }
    end
  end
def create
    @member = Member.new(params[:member])
    respond_to do |format|
      if @member.save
        format.html { redirect_to(@member, :notice => 'Member was successfully created.') }
        format.xml  { render :xml => @member, :status => :created, :location => @member }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @member.errors, :status => :unprocessable_entity }
      end
    end
  end

开发日志： http://pastebin.com/n9E2nyFv（会员表有很多字段）

到目前为止我尝试的是省略嵌套表单，它确实有效。
另外，我基于这种通过RailsCasts（http://railscasts.com/episodes/73-complex-forms-part-1）使用嵌套表单的方式。

如何使用嵌套表单成功提交？

提前谢谢！：）

Answer 1

我认为您正在错误地构建嵌套表单：

#app/views/members/new.html.erb
 <% for children_information in @member.children_informations %>
     <%= fields_for "member[child_info_attrib][]", children_information do |children_info_form| %>
      <div class="field">
        <%= children_info_form.label :name, "Name" %><br />
        <%= children_info_form.text_field :name %>
      </div>
      <div class="field">
        <%= children_info_form.label :gender, "Gender" %><br />
        <%= children_info_form.select :gender, options_for_select(["Male", "Female"]) %>
      </div>
      <div class="field">
        <%= children_info_form.label :birthdate, "Birthdate" %><br />
     nn <%= children_info_form.datetime_select :birthdate, :discard_hour => true, 
:order => [:month, :day, :year], :start_year => 1900 %>
        </div>
   </div>
       <% end %>
  <% end %>

你需要这样做：

查看

<%= f.fields_for :children_informations do |children_info_form| %> <div class="field"> <%= children_info_form.label :name, "Name" %><br /> <%= children_info_form.text_field :name %> </div> <div class="field"> <%= children_info_form.label :gender, "Gender" %><br /> <%= children_info_form.select :gender, options_for_select(["Male", "Female"]) %> </div> <div class="field"> <%= children_info_form.label :birthdate, "Birthdate" %><br /> nn <%= children_info_form.datetime_select :birthdate, :discard_hour => true, :order => [:month, :day, :year], :start_year => 1900 %> </div> </div> <% end %>

这将创建具有正确数据的表单元素，但我也认为您可以改进对数据的处理。当你在Rails 3上时，我会等待评论，看看你是否希望我为它写一些代码！

Answer 2

您关注的轨道广播剧集的日期是2007年。我不认为这种方法在嵌套表单中是最好的。

此

def child_info_attrib=(attribs)
    attribs.each do |attrib|
      children_informations.build(attrib)
    end
end

可以简化为此（如果您使用的是rails 3.x＆gt;）

attr_accessible：childs_attributes
accepts_nested_attributes_for：childs

如果你想要参考或一些教程，我会建议你 http://railscasts.com/episodes/196-nested-model-form-revised
http://railscasts.com/episodes/197-nested-model-form-part-2

或者如果你不这些，你可以看看这个宝石 https://github.com/nathanvda/cocoon
这简化了你想要实现的目标。

Answer 3

这是一个错误，我破坏了关于嵌套表单（http://railscasts.com/episodes/73-complex-forms-part-1）的RailsCasts剧集的注释，它已经过时了，我应该按照上述主题的最新一集（http://railscasts.com/episodes/196-nested-model-form-part-1）。它现在有效：）

在Rails中提交嵌套表单时出现500内部服务器错误

3 个答案: