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我按照这个截屏视频制作了一个嵌套模型表单。 http://railscasts.com/episodes/196-nested-model-form-part-1

现在，我正在尝试在我的应用程序中包含这样一个嵌套模型表单，但我收到了一个参数错误（参数数量错误（0 代表 1））。

我似乎无法弄清楚我哪里出错了，我想就我可以尝试什么以及为什么可能会发生一些错误寻求一些建议。

错误发生在主题模型中的这一行。

has_many :lessons, :dependent => destroy

其他相关代码：

主题控制器：

  def new
    @subject = Subject.new
    #3 times one for lecture one for lab one for tut.
    3.times{@subject.lessons.build}

    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @subject }
      format.js
    end
  end

主题模型

class Subject < ActiveRecord::Base
  has_many :lessons, :dependent => destroy
  attr_accessible :lesson_attributes, :acad_unit, :cohort_size, :discipline, :remarks, :subject_code, :subject_name, :year_of_study
  accepts_nested_attributes_for :lessons, :reject_if => lambda { |a| a[:lesson_type].blank? }, :allow_destroy => true
end

课程模型

class Lesson < ActiveRecord::Base
  belongs_to :subject
  attr_accessible  :frequency, :lesson_type, :no_of_lesson, :possible_venues
end

_form.html.erb

    <%= form_for(@subject,:remote=>true) do |f| %>
  <% if @subject.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@subject.errors.count, "error") %> prohibited this subject from being saved:</h2>

      <ul>
      <% @subject.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :subject_code %><br />
    <%= f.text_field :subject_code %>
  </div>
  <div class="field">
    <%= f.label :subject_name %><br />
    <%= f.text_field :subject_name %>
  </div>
  <div class="field">
    <%= f.label :year_of_study %><br />
    <%= f.text_field :year_of_study %>
  </div>
  <div class="field">
    <%= f.label :discipline %><br />
    <%= f.text_field :discipline %>
  </div>
  <div class="field">
    <%= f.label :acad_unit %><br />
    <%= f.text_field :acad_unit %>
  </div>
  <div class="field">
    <%= f.label :cohort_size %><br />
    <%= f.text_field :cohort_size %>
  </div>
  <div class="field">
    <%= f.label :remarks %><br />
    <%= f.text_field :remarks %>
  </div>

  <ol>
  <%= f.fields_for :lessons do |builder| %>
    <%= render "lesson_fields", :f => builder %>
  <% end %>
  </ol>

<% end %>

_lesson_fields.html.erb

<p>
<div class="field">
    <%= f.label :lesson_type %><br />
    <%= f.text_field :lesson_type %>
  </div>
  <div class="field">
    <%= f.label :no_of_lesson %><br />
    <%= f.text_field :no_of_lesson %>
  </div>
  <div class="field">
    <%= f.label :frequency %><br />
    <%= f.text_field :frequency %>
  </div>
  <div class="field">
    <%= f.label :possible_venues %><br />
    <%= f.text_field :possible_venues %>
    </div>
</p>
4

1 回答 1

4

我猜你想要：

has_many :lessons, :dependent => :destroy

?

在这里，您会找到关于主题的精彩讨论。

于 2012-12-20T18:58:49.863 回答