Ruby on rails Rails 4参数未发送到控制器

我一直在努力寻找一个对某人来说很快的答案

我有嵌套部分的视图。该索引对类别具有部分属性，而对子类别具有部分属性

类别按预期循环，但由于某些原因，本地人似乎没有到达控制器

我的代码如下：

index.html.erb

<%= render partial: "categories/categories", object: @categories %>

    <% @categories.each do |category| %>
        <% if category.category_parent == 0 %>
            <li><a href=""><%= category.category_name %> <i class="icons icon-right-dir"></i></a>
                <%= render partial: "categories/subcategories", object: @subcategories, locals: {parent_id: category.category_id} %>
            </li>
        <% end %>
    <% end %>

      <% if @parent != nil %>
      <ul class="sidebar-dropdown">
        <li>
          <ul>
            <% @subcategories.each do |subcategory| %>
              <li><a href=""><%= subcategory.category_name %> <i class="icons icon-right-dir"></i></a></li>
            <% end %>
          </ul>
        </li>
      </ul>
      <% end %>

class CategoriesController < ApplicationController
  before_action :categories, :subcategories

  def categories
    @categories = Category.all
  end

  def subcategories
    @parent = params[:parent_id]
    @subcategories = Category.where(:category_parent => params[:parent_id])
  end

end

def categories
  @categories = Category.all.includes(:subcategories)
end

\u categories.html.erb

<%= render partial: "categories/categories", object: @categories %>

    <% @categories.each do |category| %>
        <% if category.category_parent == 0 %>
            <li><a href=""><%= category.category_name %> <i class="icons icon-right-dir"></i></a>
                <%= render partial: "categories/subcategories", object: @subcategories, locals: {parent_id: category.category_id} %>
            </li>
        <% end %>
    <% end %>

      <% if @parent != nil %>
      <ul class="sidebar-dropdown">
        <li>
          <ul>
            <% @subcategories.each do |subcategory| %>
              <li><a href=""><%= subcategory.category_name %> <i class="icons icon-right-dir"></i></a></li>
            <% end %>
          </ul>
        </li>
      </ul>
      <% end %>

class CategoriesController < ApplicationController
  before_action :categories, :subcategories

  def categories
    @categories = Category.all
  end

  def subcategories
    @parent = params[:parent_id]
    @subcategories = Category.where(:category_parent => params[:parent_id])
  end

end

def categories
  @categories = Category.all.includes(:subcategories)
end

\u subcategories.html.erb

<%= render partial: "categories/categories", object: @categories %>

    <% @categories.each do |category| %>
        <% if category.category_parent == 0 %>
            <li><a href=""><%= category.category_name %> <i class="icons icon-right-dir"></i></a>
                <%= render partial: "categories/subcategories", object: @subcategories, locals: {parent_id: category.category_id} %>
            </li>
        <% end %>
    <% end %>

      <% if @parent != nil %>
      <ul class="sidebar-dropdown">
        <li>
          <ul>
            <% @subcategories.each do |subcategory| %>
              <li><a href=""><%= subcategory.category_name %> <i class="icons icon-right-dir"></i></a></li>
            <% end %>
          </ul>
        </li>
      </ul>
      <% end %>

class CategoriesController < ApplicationController
  before_action :categories, :subcategories

  def categories
    @categories = Category.all
  end

  def subcategories
    @parent = params[:parent_id]
    @subcategories = Category.where(:category_parent => params[:parent_id])
  end

end

def categories
  @categories = Category.all.includes(:subcategories)
end

categories\u controller.rb

<%= render partial: "categories/categories", object: @categories %>

    <% @categories.each do |category| %>
        <% if category.category_parent == 0 %>
            <li><a href=""><%= category.category_name %> <i class="icons icon-right-dir"></i></a>
                <%= render partial: "categories/subcategories", object: @subcategories, locals: {parent_id: category.category_id} %>
            </li>
        <% end %>
    <% end %>

      <% if @parent != nil %>
      <ul class="sidebar-dropdown">
        <li>
          <ul>
            <% @subcategories.each do |subcategory| %>
              <li><a href=""><%= subcategory.category_name %> <i class="icons icon-right-dir"></i></a></li>
            <% end %>
          </ul>
        </li>
      </ul>
      <% end %>

class CategoriesController < ApplicationController
  before_action :categories, :subcategories

  def categories
    @categories = Category.all
  end

  def subcategories
    @parent = params[:parent_id]
    @subcategories = Category.where(:category_parent => params[:parent_id])
  end

end

def categories
  @categories = Category.all.includes(:subcategories)
end

class CategoriesControllerparams[：parent\u id]）
终止
终止

@categories

是一个实例变量，您不需要在视图之间传递它。因此，第一个渲染状态变为：

<%= render "categories/categories" %>

\u subcategories.html.erb

<% if category != nil %>
  <ul class="sidebar-dropdown">
    <li>
      <ul>
        <% category.subcategories.each do |subcategory| %>
          <li><a href=""><%= subcategory.category_name %> <i class="icons icon-right-dir"></i></a></li>
        <% end %>
      </ul>
    </li>
  </ul>
<% end %>

---

这是我认为最简单和最清楚的。但是我也没有玩太多的

对象：

。如果你想坚持这种模式，这可能会对你有所帮助：

谢谢你的快速回答和帖子的链接。我在@categories=Category.all.includes（：subcategories）附近发现一个mongoid错误。上面写着“无效包含指令”哦！蒙哥德。是的，

.all

现在在ActiveRecord中的工作方式有所不同，在Mongoid中可能不是这样。您应该能够只执行以下操作：

Category.includes（：subcategories）

它表示以下内容：问题：无效的includes指令：Category.includes（：subcategories）摘要：Mongoid中的即时加载仅支持向Category.includes提供参数，这些参数是类别模型中关系的名称，并且只支持一个级别的即时加载。（即，不允许通过另一个关系一步一步地加载不在类别上的关联。解决方案：确保传递给Category.includes的每个参数都是类别模型上关系的有效名称。这些参数是：。首先，在不使用includes的情况下尝试，以确保其工作。includes只是为了提高性能。假设它能工作，类别和子类别之间的关系是什么？如果它是

有很多

，那么我认为它应该像ActiveRecord（我更熟悉的是ActiveRecord）一样工作。如果它是

嵌入了很多

，那么包含可能就没有必要了。