Ruby on rails 轨道可以'；无法找到子窗体的销毁方法

我有两门课，

Event

和

LivingGroup

LivingGroup有很多活动，因此我为
LivingGroup
在我的_form.html.erb中添加了以下内容：

<div id='event_children'>
  <% f.fields_for :events do |event_form| %>
    <%= render :partial => 'event', :locals => { :f => event_form } %>
  <% end %>
</div>

<p>
  <%= add_child_link 'Add Event', 'event', f %>
</p>

但是，我在rails中遇到以下错误：

NoMethodError in Living_groups#new

Showing app/views/living_groups/_event.html.erb where line #24 raised:

undefined method `_destroy' for #<Event:0x7f6da74b1a60>

Extracted source (around line #24):

21:   </p>
22:   <p>
23:     <%= f.hidden_field :destroy, :class => 'delete' %>
24:     <%= remove_child_link 'remove', f %>
25:   </p>
26: </div>
Trace of template inclusion: app/views/living_groups/_form.html.erb, app/views/living_groups/new.html.erb

编辑：哎呀。希望这对其他人有所帮助。
哎呀，在rails 2.3.5中删除了

NoMethodError in Living_groups#new

Showing app/views/living_groups/_event.html.erb where line #24 raised:

undefined method `_destroy' for #<Event:0x7f6da74b1a60>

Extracted source (around line #24):

21:   </p>
22:   <p>
23:     <%= f.hidden_field :destroy, :class => 'delete' %>
24:     <%= remove_child_link 'remove', f %>
25:   </p>
26: </div>
Trace of template inclusion: app/views/living_groups/_form.html.erb, app/views/living_groups/new.html.erb

  # DELETE /events/1
  # DELETE /events/1.xml
  def destroy
    @event = Event.find(params[:id])
    @event.destroy

    respond_to do |format|
      format.html { redirect_to(events_url) }
      format.xml  { head :ok }
    end
  end