ruby-on-rails - 在 Rails 中提交嵌套表单时出现 500 Internal Server Error

Question

当我提交具有两个模型(Member 和 ChildrenInformation)的嵌套表单时，出现 500 Internal Server Error。

错误:

500 Internal Server Error

If you are the administrator of this website, then please read this web application's log file and/or the web server's log file to find out what went wrong.

我检查了日志文件，这是我发现的:

TypeError (expected Hash (got Array) for param `child_info_attrib'):

这是我的rails项目的其他部分

查看(new.html.erb>

  <%= 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(成员(member))

 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( child 信息)

class ChildrenInformation < ActiveRecord::Base
    belongs_to :member
end

Controller (成员 Controller )

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 (members表有很多字段)

到目前为止我尝试的是省略嵌套形式，它确实有效。
此外，我通过 RailsCasts ( http://railscasts.com/episodes/73-complex-forms-part-1 ) 基于这种使用嵌套形式的方式。

如何使用嵌套表单成功提交？

提前致谢! :)

Answer 1

我认为您构建的嵌套表单不正确:

#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。由于您正在使用 Rails 3，我将等待您的评论，看看您是否希望我为它编写一些代码!