想不通的ActiveRecord :: SubclassNotFound在注册＃编辑？ [英] Can't figure out ActiveRecord::SubclassNotFound in Registries#edit?

问题描述

当在编辑或表演这来了：

的ActiveRecord :: SubclassNotFound在注册＃修改

的单表继承机制未能找到该子类：'飞机'引发此错误的原因列'类型'被保留用于存储类的情况下继承请，如果你没有重命名此列打算将它用于存储继承类或覆盖present.inheritance_column使用另一列提供的信息。

  25：＆LT; / DIV＆GT;
26：
27：＆LT; D​​IV CLASS =字段1＆GT;
28：＆LT;％= f.fields_for：presents办|制造商| ％＆GT;
29：＆LT;％=渲染'present_fields'，F：建设者％＆GT;
30：＆LT;％结束％GT;
31：＆LT; / DIV＆GT;
 

下面的登记表：

 ＆LT;％= nested_form_for（@registry）办| F | ％＆GT;
＆LT;％@如果registry.errors.any？ ％＆GT;
＆LT; D​​IV ID =error_explanation＆GT;
＆LT; H2＆GT;＆LT;％=复数（@ registry.errors.count，错误）％＆GT;禁止此注册表从
被保存：＆LT; / H＆GT;

  ＆LT; UL＆GT;
  ＆LT;％@ registry.errors.full_messages.each办|味精| ％＆GT;
    ＆LT;李＆GT;＆LT;％=味精％＆GT;＆LT; /李＆GT;
  ＆LT;％结束％GT;
  ＆LT; / UL＆GT;
＆LT; / DIV＆GT;
＆LT;％结束％GT;


＆LT;％= f.label：DUE_DATE％＆GT;＆LT; BR /＆GT;
＆LT;％= f.date_select：DUE_DATE，：行数=＆GT; 5％GT;


＆LT;％= f.label：主题％＆GT;＆LT; BR /＆GT;
＆LT;％= f.text_field：主题：类=＆GT; FIELD2％＆GT;

＆LT; D​​IV CLASS =字段1＆GT;
＆LT;％= f.label：性别％＆GT;＆LT; BR /＆GT;
＆LT;％= f.text_field：性别％＆GT;
＆LT; / DIV＆GT;

＆LT; D​​IV CLASS =字段1＆GT;
＆LT;％= f.fields_for：presents办|制造商| ％＆GT;
＆LT;％=渲染'present_fields'，F：建设者％＆GT;
＆LT;％结束％GT;
＆LT; / DIV＆GT;

＆LT;％= link_to_add_fields添加presents，F：presents％GT;

＆LT; D​​IV CLASS =行动＆GT;
＆其中;％= f.submit％GT;
＆LT; / DIV＆GT;
＆LT;％结束％GT;
 

在presents_fields：

 ＆LT; D​​IV CLASS =字段1＆GT;
＆LT;表＆gt;
＆其中; TR＆GT;
＆LT; TD＆GT; ＆LT;％= f.label：类型，present键入％＆GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.text_field：类型：类=＆GT; FIELD2％＆GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.label：数量，数量％GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.number_field：数量：类=＆GT; FIELD3％＆GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.label：颜色，颜色％＆GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.text_field：色泽：类=＆GT; FIELD2％＆GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.label：品牌，品牌％GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.text_field：品牌：类=＆GT; FIELD2％＆GT; ＆LT; / TD＆GT;
＆LT; TD＆GT; ＆LT;％= f.link_to_remove删除此present％＆GT;＆LT; / TD＆GT;
＆LT; / TR＆GT;
＆LT; /表＆gt;
＆LT; / DIV＆GT;
 

解决方案

无论是重命名或覆盖的错误说： 通过类似

覆盖

  set_inheritance_columnnot_sti
 

来源： <一href="http://my.safaribooksonline.com/book/web-development/ruby/9780132480345/advanced-active-record/ch09lev1sec5" rel="nofollow">http://my.safaribooksonline.com/book/web-development/ruby/9780132480345/advanced-active-record/ch09lev1sec5

When in "edit" or "show" this comes up:

ActiveRecord::SubclassNotFound in Registries#edit

"The single-table inheritance mechanism failed to locate the subclass: 'Plane'. This error is raised because the column 'type' is reserved for storing the class in case of inheritance. Please rename this column if you didn't intend it to be used for storing the inheritance class or overwrite Present.inheritance_column to use another column for that information."

25:   </div>
26:   
27:   <div class="field1">
28:   <%= f.fields_for :presents do |builder| %>
29:   <%= render 'present_fields', f: builder %>
30:   <% end %>
31:   </div>

Here is the Registry Form:

<%= nested_form_for(@registry) do |f| %>
<% if @registry.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@registry.errors.count, "error") %> prohibited this registry from    
being saved:</h2>

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


<%= f.label :due_date %><br />
<%= f.date_select :due_date, :rows => 5 %>


<%= f.label :theme %><br />
<%= f.text_field :theme, :class => 'field2' %>

<div class="field1">
<%= f.label :gender %><br />
<%= f.text_field :gender %>
</div>

<div class="field1">
<%= f.fields_for :presents do |builder| %>
<%= render 'present_fields', f: builder %>
<% end %>
</div>

<%= link_to_add_fields "Add Presents", f, :presents %>

<div class="actions">
<%= f.submit %>
</div>
<% end %>

The presents_fields:

<div class="field1">
<table>
<tr> 
<td> <%= f.label :type, "Present Type" %> </td>
<td> <%= f.text_field :type, :class => 'field2' %> </td>
<td> <%= f.label :Quantity, "Quantity" %> </td>
<td> <%= f.number_field :quantity, :class => 'field3' %> </td>
<td> <%= f.label :color, "Color" %> </td>
<td> <%= f.text_field :color, :class => 'field2' %> </td>
<td> <%= f.label :brand, "Brand" %> </td>
<td> <%= f.text_field :brand, :class => 'field2' %> </td>
<td> <%= f.link_to_remove "Remove this present" %></td>
</tr>
</table>
</div>

解决方案

Either rename or overwrite as the errors says overwrite via something like

set_inheritance_column "not_sti"

source: http://my.safaribooksonline.com/book/web-development/ruby/9780132480345/advanced-active-record/ch09lev1sec5

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