一对一关系的嵌套属性 [英] Nested attributes for one-to-one relation

问题描述

我有一家拥有一个订阅的公司.现在，我想要一个表单来添加或编辑公司和订阅，因此我使用"accepts_nested_attributes_for".这是公司模型的一部分(部分):

I have a Company which has one Subscription. Now I want a form to add or edit the company and the subscription, so I use "accepts_nested_attributes_for". This is (part of) the Company model:

  has_one :subscription, :dependent => :destroy
  accepts_nested_attributes_for :subscription

这是订阅模型的一部分(部分):

This is (part of) the Subscription model:

  belongs_to :company

在控制器中，我有这个:

In the controller I have this:

  def new
    @company = Company.new(:subscription => [Subscription.new])
  end

  def create
    @company = Company.new(params[:company])

    if @company.save
      redirect_to root_path, notice: I18n.t(:message_company_created)
    else
      render :action => "new"
    end
  end

  def edit
    @company = Company.find(params[:id])
  end

  def update
    @company = Company.find(params[:id])

    if @company.update_attributes(params[:company])
      redirect_to root_path, :notice => I18n.t(:message_company_updated)
    else
      render :action => "edit"
    end

  end

表单如下:

      <%= f.fields_for(:subscription) do |s_form| %>
        <div class="field">
            <%= s_form.label I18n.t(:subscription_name) %>
        <%= s_form.text_field :name %>
      </div>
  <% end %>

这带来2个问题:

• 仅当公司已经有订阅时，名称字段才显示在编辑表单中，而在添加新公司时则不显示
• 在编辑公司并更改订阅的名称字段时，更改不会保存.

我在这里做错了什么?

What am I doing wrong here?

我正在使用3.1版的Rails

I'm using version 3.1 of Rails

推荐答案

我认为您应该将新操作更改为:

I think you should change your new action to:

def new
  @company = Company.new
  @company.build_subscription
end

有关更多信息，请参见文档.然后，我认为您必须将subscription_attributes添加到公司的 attr_accessible 列表中定义.

See docs for further information. Then I think you have to add subscription_attributes to the attr_accessible list of your Company definition.

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