Rails-我无法使用嵌套表单在用户表单上显示位置 [英] Rails - I can't display locations on my users form using nested forms

问题描述

我无法使用嵌套表单显示登录到用户的位置.

I can't display the locations that belogns to the user using nested forms.

我要创建用户并在位置模型中保存地址，城市，州等，并在用户模型中保存名称，用户名和电子邮件.

I want to create the user and save the address, city, state, etc in location model and the name, username, email in the user model.

我在控制台上没有错误.但是没有显示字段(选择或下拉列表，text_fields等).数据库中有记录.

I have no errors on the console. But the fields (select or dropdowns, text_fields, etc) are not showing up. The database has records.

这是我的user.rb模型:

This is my user.rb model:

class User < ActiveRecord::Base

has_many :locations
   accepts_nested_attributes_for :locations   
end

这是我的location.rb模型:

This is my location.rb model:

class Location < ActiveRecord::Base
   belongs_to :user
end

这是我的用户表单:

<div class="col-xs-12 col-sm-12 col-md-8 col-lg-8">
  <%= form_for(["admin", @user]) do |f| %>
    <% if @user.errors.any? %>
      <div id="error_explanation">
        <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>

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

    <div class="field">
      <%= f.label :name %><br>
      <%= f.text_field :name %>
    </div>
    <div class="field">
      <%= f.label :username %><br>
      <%= f.text_field :username %>
    </div>
    <div class="field">
      <%= f.label :email %><br>
      <%= f.text_field :email %>
    </div>
    <div class="field">
      <%= f.label :password %><br>
      <%= f.text_field :password %>
    </div>

    <!-- Here is the nested form -->

    <%= f.fields_for :locations do |location| %>
      <%= location.label :country %>
      <%= location.select :country%>

      <%= location.label :state %>
      <%= location.text_field :state%>

    <% end %>

    <div class="actions form-group">
      <%= f.submit class: 'form-control' %>
    </div>
  <% end %>

推荐答案

在您的视图中添加以下行:

Add the following line to your view:

<% f.object.locations.build if f.object.locations.empty? %>
<%= f.fields_for :locations do |location| %>
....

您也可以在控制器中添加此逻辑，但是我将其添加到视图中.为什么?因为如果您想在另一个控制器中重用此表单，则必须复制代码.

You can also add this logic in controller, but I would add it to the view. Why? Because if you would want to reuse this form in another controller, you will have to duplicate your code.

如果将来您想添加多个位置，我建议您观看以下两个臭鼬":

And if you want to add more than one location in the future, I would suggest you to watch these two railscats:

http://railscasts.com/episodes/196-nested-model-form-part-1
http://railscasts.com/episodes/197-nested-model-form-part-2

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