嵌套形式和一对一关系 [英] nested forms and one to one relationship

问题描述

我与用户和目标之间是一对一的关系.我想构建一个显示用户目标的表单.问题是我的代码仅在用户已经定义了目标时才有效.如果没有目标，则不会显示文本字段.

I have a one-to-one relationship between user and goal. I want to build a form that shows the goal of a user. The problem is that my code only works when the user already has a goal defined. The text field is not rendered when no goal is present.

<%= user_builder.fields_for :goal do |goal_builder| %>
   <%= goal_builder.text_field :goal %>
<% end %>

Rails提供了一种简便的方法吗?

Does Rails provide an easy way to do this?

推荐答案

这就是我的做法:

class User < ActiveRecord::Base
  has_one :goal
  accepts_nested_attributes_for :goal
  after_initialize do
    self.goal ||= self.build_goal()
  end
end

这篇关于嵌套形式和一对一关系的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！