Question

undefined method `hname' for #<Wife:0x007f1eb7f91230> Did you mean? wname

嗨！我是ruby的新手，我正在学习如何手动制作嵌套表格而不是使用脚手架大约1周，但仍然无法找到制作它的方法，我做了很多研究，但仍然找不到正确的解决请帮助我知道我的问题和缺少语法。提前谢谢！

这是我的表格：

    mysql> desc husbands;
+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| id         | int(11)      | NO   | PRI | NULL    | auto_increment |
| hname      | varchar(255) | YES  |     | NULL    |                |
| wife_id    | int(11)      | YES  | MUL | NULL    |                |
| kabet_id   | int(11)      | YES  | MUL | NULL    |                |
| created_at | datetime     | NO   |     | NULL    |                |
| updated_at | datetime     | NO   |     | NULL    |                |
+------------+--------------+------+-----+---------+----------------+
6 rows in set (0.01 sec)

mysql> desc wives;
+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| id         | int(11)      | NO   | PRI | NULL    | auto_increment |
| wname      | varchar(255) | YES  |     | NULL    |                |
| created_at | datetime     | NO   |     | NULL    |                |
| updated_at | datetime     | NO   |     | NULL    |                |
+------------+--------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)

mysql> desc kabets;
+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| id         | int(11)      | NO   | PRI | NULL    | auto_increment |
| kname      | varchar(255) | YES  |     | NULL    |                |
| created_at | datetime     | NO   |     | NULL    |                |
| updated_at | datetime     | NO   |     | NULL    |                |
+------------+--------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)

以下是我的代码：

wife.rb

class Wife < ActiveRecord::Base
    has_one :husband

    accepts_nested_attributes_for :husband
    validates_presence_of :hname
end

husband.rb

class Husband < ActiveRecord::Base
    belongs_to :wife
    belongs_to :kabet

    accepts_nested_attributes_for :wife
end

kabet.rb

class Kabet < ActiveRecord::Base
    has_one :husband

    accepts_nested_attributes_for :husband
end

丈夫控制员：

class HusbandsController < ApplicationController
  def index
    @husbands = Husband.all
  end

  def show
    @husband = Husband.find(params[:id])
  end

  def new
    @husband = Husband.new
    @husband.build_wife
    @husband.build_kabet
  end

  def create
    @husband = Husband.new(husband_params)
    @husband.build_wife
    @husband.build_kabet
    @husband.save
    redirect_to action: "show"
  end

  private
  def husband_params
    params.require(:husband).permit(:hname, :wife_id, :kabet_id, wife_attributes:[:id,:wname], kabets_attributes:[:id,:kname])
  end
end

妻子控制员：

class WivesController < ApplicationController
  def index
    @wives = Wife.all
  end

  def new
    @wife = Wife.new
    @wife.build_husband
  end

  def create
    @wife = Wife.new(wife_params)
   #@wife.build_husband
    @wife.save
    redirect_to action: "index"
  end

  def show
  end

  private
  def wife_params
    params.require(:wife).permit(:id,:wname, husband_attributes: [:id,:hname])
  end
end

丈夫的查看表格：

<%= form_for @husband do |f| %>
<table>
    <tr>
        <th>Name ng Husband</th>
        <th>Name ng Legal Wife</th>
        <th>Name ng Kabet</th>
    </tr>
    <tr>
        <td><%= f.text_field :hname %></td>
        <%= f.fields_for :wife do |wife| %>
        <td><%= wife.text_field :wname %></td>
        <% end %>
        <%= f.fields_for :kabets do |kabet| %>
        <td><%= kabet.text_field :kname %></td>
        <% end %>
    </tr>

<%= f.submit %>   
</table>
<% end %>

查看妻子的表格：

<%= form_for @wife do |f| %>
<table>
    <tr>
        <th><%= f.label :wname %></th>
        <td><%= f.text_field :wname %></td>
    </tr>
    <%= f.fields_for :husbands do |ff| %>
    <tr>
        <th><%= ff.label :hname %></th>
        <td><%= ff.text_field :hname %></td>
    <% end %>
    </tr>
</table>
<%= f.submit %>
<% end %>

即使我在丈夫的表格或妻子的形式上创作也无所谓，我仍然会遇到这个错误：

undefined method `hname' for #<Wife id: nil, wname: "zzxc", created_at: nil, updated_at: nil> Did you mean? wname

Extracted source (around line #14):

Answer 1

在Wife模型中，您提到了validates_presence_of :hname，但hname表中没有Wife。它在husband表中。这就是它给出错误的原因。

相反，您可以将该验证移至Husband模型并在Wife模型中使用：

validates_associated: husband如果您确实要在保存hanme对象之前验证wife名称。

请注意，我没有在nested form设置中检查您的代码是否存在任何其他可能的错误。首先修复此错误，然后您可以继续进行，一步一步。

Answer 2

在您的Cust no. Chg Key Value Size Name 61 A Ctot1 2 2 XA 61 A Ctot2 3 2 XA 61 A Ctot3 4 2 XA 61 A Ctot4 5 2 XA中，您为什么WivesController发表了评论。仅这一点就是你问题的一个原因。取消注释该行，一切都应该没问题。如果不起作用，请尝试以下

在#@wife.build_husband中使用pry并尝试在此wives view上调用其关联，如果您获得nil，那么您将必须构建此类关联{ {1}}。我知道你已经在控制器中构建了它，但是为了调试，请尝试在视图中构建并查看事情的进展情况。
validates_presence_of：hname应在不在@wives.husband模型中的@wives.build_husband模型中完成。或者，您可以验证Husband是否存在嵌套属性，例如

Wife

希望这可以帮助你。

Ruby on Rails 4.2中的嵌套表单，无法识别fields_for中的参数

2 个答案: