文本框的字段未使用嵌套属性出现

我试图将消息保存到我的广告系列中，但文本字段未显示。我尝试了几种不同的变体，但似乎无法使它起作用。我在fields_for中放置了一个调试器，并且代码甚至没有达到该逻辑。这是代码：

  def new
    @campaign = Campaign.new
    @message = Message.new(:campaign_id => @campaign.id)
  end
  def edit
    @campaign = Campaign.find(params[:id])
    @message = @campaign.message
  end
  %legend
    Enter the campaign information
  .field
    .control-group
      %label.control-label
        Campaign Name
      .controls
        = f.text_field :name
        = f.collection_select(:group_id, current_user.groups.all, :id, :name, :include_blank => true)
        = f.fields_for :message do |m|
          = m.text_area :body, :rows => 3
      .form-actions= f.submit "#{params[:action] == 'new' ? 'Create New Campaign' : 'Save Campaign'}", :class => 'btn btn-success'

为什么text_area不在页面上显示？

在新操作或@campaign.messages.new

中尝试@campaign.build_message

为您的解决方案执行此操作，然后尝试

def new
  @campaign = Campaign.new
  @message = @campaign.build_message
end

和在您的模型文件中，写

accepts_nested_attributes_for :message

有关更多信息-http：//railscasts.com/episodes/196-nested-model-form-part-1

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