Ruby on Rails：打印Wishlist的show方法HTTP路径并渲染至独立视图

我有一个名为wishlists的简单应用，应用逻辑如下：

• 用户进入首页
• 用户可选择新建心愿单或查看已有心愿单
• 用户点击新建心愿单后，进入独立视图输入心愿单名称并提交

目前新建心愿单后会跳转到对应的show视图，我希望改为打印show控制器方法的HTTP路径（/wishlists/:id(.:format)）并渲染到独立视图，后续用于前端弹窗开发。

控制器代码（WishlistsController） #

class WishlistsController < ApplicationController
  before_action :set_wishlist, only: %i[ show edit update destroy ]

  
  # GET /home
  def home 
  end 
  
  # GET /wishlists
  def index
    @wishlists = Wishlist.all
  end

  # GET /wishlists/1
  def show
  end

  # GET /wishlists/new
  def new
    @wishlist = Wishlist.new
  end

  # GET /wishlists/1/edit
  def edit
  end

  # POST /wishlists
  def create
    @wishlist = Wishlist.new(wishlist_params)

    if @wishlist.save
       redirect_to @wishlist, notice: "Wishlist was successfully created."
    else
      render :new, status: :unprocessable_entity
    end
  end

  # PATCH/PUT /wishlists/1
  def update
    if @wishlist.update(wishlist_params)
      redirect_to @wishlist, notice: "Wishlist was successfully updated."
    else
      render :edit, status: :unprocessable_entity
    end
  end

  # DELETE /wishlists/1
  def destroy
    @wishlist.destroy
    redirect_to wishlists_url, notice: "Wishlist was successfully destroyed."
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_wishlist
      @wishlist = Wishlist.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def wishlist_params
      params.require(:wishlist).permit(:name, :wishlist_link)
    end
end

表单视图（_form.html.erb） #

<%= form_with(model: wishlist) do |form| %>
  <% if wishlist.errors.any? %>
    <div style="color: red">
      <h2><%= pluralize(wishlist.errors.count, "error") %> prohibited this wishlist from being saved:</h2>

      <ul>
        <% wishlist.errors.each do |error| %>
          <li><%= error.full_message %></li>
        <% end %>
      </ul>
    </div>
  <% end %>

  <div>
    <%= form.label :name, style: "display: block" %>
    <%= form.text_field :name %>
  </div>

  <div>
    <%= form.submit %>
  </div>
<% end %>

新建视图（new.html.erb） #

<h1>New wishlist</h1>

<%= render "form", wishlist: @wishlist %>

<br>


<div>
  <%= link_to "Back to homepage", root_path %>
</div>

实现步骤： #

1. 修改控制器create方法
   替换原有的跳转逻辑，改为渲染自定义视图并传递路径变量：

   # POST /wishlists
   def create
     @wishlist = Wishlist.new(wishlist_params)
   
     if @wishlist.save
       # 生成带实际ID的show路径
       @show_path = wishlist_path(@wishlist)
       # 渲染自定义展示视图
       render :show_path_display, notice: "Wishlist was successfully created."
     else
       render :new, status: :unprocessable_entity
     end
   end
   

2. 创建展示路径的视图文件
   在app/views/wishlists目录下新建show_path_display.html.erb，内容如下：

   <h1>心愿单创建成功</h1>
   <p>Show路径：<%= @show_path %></p>
   
   <div>
     <%= link_to "返回首页", root_path %>
     <%= link_to "查看心愿单", @show_path %>
   </div>
   

3. 如果需要显示带占位符的路由模板
   若要输出/wishlists/:id(.:format)这种原始路由格式，修改create方法中的变量：

   @show_route_template = Rails.application.routes.named_routes[:wishlist].path.spec.to_s
   

   然后在视图中替换为<%= @show_route_template %>即可。

内容的提问来源于stack exchange，提问作者Aly Dabbous