如何链接到循环内的嵌套路由路径？

在我的应用程序中，我有故事和子故事。子故事嵌套在故事内部storiesindex.html.erb。我在所有故事中循环，在内部我在所有子故事中循环。

这是代码：

<% @stories.each do |story| %>
  <%= story.title %>
  <%= story.plot %>

  <%= link_to 'Show', story_path(story) %>
  <%= link_to 'Edit', edit_story_path(story) %>
  <%= link_to "Delete", story_path(story), method: :delete, data: { confirm: "Are you sure?" } %>

  <% story.substories.each do |substories| %>
    <%= substories.title %>
    <%= substories.subplot %>
  <% end %>

<% end %>

<%= link_to 'New Story', new_story_path %>

这工作正常，但我想通过在第二个循环内传递以下参数来链接到每个子故事的编辑页面：

<%= link_to 'Edit', edit_story_substory_path(substory.story, substory) %>

I get a NameError in Stories#index undefined local variable or method 'substory'，但是这在子故事index.html.erb file.

我还尝试过以下操作：

<%= link_to 'Edit', edit_story_substory_path(@substory.story, @substory) %>

为此我得到了NoMethodError in Stories#index undefined method 'story' for nil:NilClass

这是我的路线模型和控制器：

#routes.rb
  resources :stories do
    resources :substories
  end

#story.rb
has_many :substories

#substory.rb
belongs_to :story

故事控制器.erb

  before_action :set_story, only: [:show, :edit, :update, :destroy]

  def index
    @stories = Story.all
  end

  def show
    @substories = Substory.where(story_id: @story.id).order("created_at DESC")
  end

  def new
    @story = Story.new
  end

  def edit
  end

  def create
    @story = Story.new(story_params)

    respond_to do |format|
      if @story.save
        format.html { redirect_to root_path, notice: 'Story was successfully created.' }
        format.json { render :show, status: :created, location: root_path }
      else
        format.html { render :new }
        format.json { render json: root_path.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @story.update(story_params)
        format.html { redirect_to root_path, notice: 'Story was successfully updated.' }
        format.json { render :show, status: :ok, location: root_path }
      else
        format.html { render :edit }
        format.json { render json: @story.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @story.destroy
    respond_to do |format|
      format.html { redirect_to stories_url, notice: 'Story was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    def set_story
      @story = Story.find(params[:id])
    end

    def story_params
      params.require(:story).permit(:title, :plot)
    end

substories_controller.erb

before_action :set_substory, only: [:show, :edit, :update, :destroy]
  before_action :set_story

  def index
    @substories = Substory.all
  end

  def show
  end

  def new
    @substory = Substory.new
  end

  def edit
  end

  def create
    @substory = Substory.new(substory_params)
    @substory.user_id = current_user.id
    @substory.story_id = @story.id
    if
      @substory.save
        redirect_to @story
    else
      render 'new'
    end
  end

  def update
    respond_to do |format|
      if @substory.update(substory_params)
        format.html { redirect_to root_path, notice: 'Story was successfully updated.' }
        format.json { render :show, status: :ok, location: root_path }
      else
        format.html { render :edit }
        format.json { render json: @story.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @substory.destroy
    redirect_to root_path
  end

  private
    def set_story
      @story = Story.find(params[:story_id])
    end

    def set_substory
      @substory = Substory.find(params[:id])
    end

    def substory_params
      params.require(:substory).permit(:title, :subplot)
    end

我缺少什么？

<% story.substories.each do |substory| %>
    <%= substory.title %>
    <%= substory.subplot %>

    <% if substory %>
        <%= link_to 'Edit', edit_story_substory_path(substory.story, substory) %>
    <% end %>

<% end %>

你刚刚打错字了。如果你在 Stories#index 上声明 @substory 也可以工作