Ruby on Rails视图无法渲染（加载空白）：RSS Feed实现问题

我正在Ruby on Rails中实现RSS Feed以同步房地产房源（先对接Zillow，后续扩展其他平台），但目前遇到视图无法加载的问题。已在Stack Overflow搜索相关问题但未找到可行方案，若问题重复深表歉意。

环境信息 #

• Ruby on Rails版本：7.0.4

路由配置 #

require 'sidekiq/web'
require 'sidekiq/cron/web'
Rails.application.routes.draw do
  if ENV['ENABLE_INTERNAL_ROUTES'] || Rails.env.development?
    mount Sidekiq::Web => '/sidekiq'
    mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
  end

  mount GraphiQL::Rails::Engine, at: "/graphiql", graphql_path: "/graphql" if ENV['APP_ENV'] != 'production'
  post "/graphql", to: "graphql#execute"
  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html

  # Defines the root path route ("/")
  # root "articles#index"

  mount Rswag::Ui::Engine => '/api-docs'
  mount Rswag::Api::Engine => '/api-docs'

  get '/feeds/zillow', to: 'feeds#zillow'
end

控制器代码 #

Feeds控制器（app/controllers/feeds_controller.rb） #

class FeedsController < ApplicationController
  def zillow
    @listings = Listing.where(syndication_type: 'SYNDICATION_ON')
    respond_to do |format|
      format.html { render "feeds/zillow" }
      format.rss { render layout: false }
    end
  end
end

ApplicationController（app/controllers/application_controller.rb） #

class ApplicationController < ActionController::API
  include ActionController::MimeResponds
end

视图文件 #

zillow.html.erb（app/views/feeds/zillow.html.erb） #

<!DOCTYPE html>
<html>
<head>
  <title>Temporary for checking</title>
</head>
<body>
  <h1>Do we even exist?</h1>
</body>
</html>

zillow.rss.builder（app/views/feeds/zillow.rss.builder） #

# app/views/posts/index.xml.builder
xml.instruct! :xml, version: "1.0"
xml.rss version: "2.0" do
  xml.channel do
    xml.title "RSS Rails"
    xml.description "Some random description. We will expand later"
  end
end

请求与响应情况 #

1. 请求RSS格式（保留layout: false） #

请求命令：

curl -i http://localhost:3000/feeds/zillow.rss

响应结果：

HTTP/1.1 200 OK
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 0
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
Content-Type: application/rss+xml; charset=utf-8
Set-Cookie: _session_id=jONgfsG5hiFzPuehEmFthv9vl8l1YATsyC912Ijjr7xZxO8YqQugUfxQt2S%2Bgi1W5s%2BBRxn4YbjxO9OSODjoxrCe7lf9lYUlVK7fnWaPAiBq1Wl49JJtarxeij8S809cUQ%2By4lXDEQKoeAn7s1ru3VK2SF%2FcB5PmgkO%2BLSfLfnfxd3s%3D--uQrBRqJR724ukUkt--xOyV9DgdzMPUplOFYye1FA%3D%3D; path=/; HttpOnly; SameSite=Lax
ETag: W/"36a9e7f1c95b82ffb99743e0c5c4ce95"
Cache-Control: max-age=0, private, must-revalidate
X-Request-Id: cc95c787-c0fb-42ab-9f80-2ab2fe57182a
X-Runtime: 0.014212
Server-Timing: start_processing.action_controller;dur=0.01, process_action.action_controller;dur=0.56
Vary: Origin
Transfer-Encoding: chunked

 % 

注：返回的单个%表示响应结束，实际会下载一个完全空的文件，而非空白页面。

2. 请求RSS格式（移除layout: false） #

请求命令：

curl -i http://localhost:3000/feeds/zillow.rss

响应结果：

HTTP/1.1 204 No Content
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 0
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
Set-Cookie: _session_id=MjmWc%2BJ%2FxvWdCymjPQxsJdNgZXkeyGs3ziJTk5lsiLTpqrLNzvYBIKDwYTtjDIBoNbBT%2FN05ukgfsns05AC9rfnafg2A%2BpF9UqFZlR7xUZNtN2xn%2BxdcpXBz7nJMRR2G6S7oH%2FfZcwEnImq5hM50iPOwugvewRjrh78no5V9Z1gsUWg%3D--XH8SskCjhWEW3pRV--bxxYHh8%2FJQeBMCm9VcmrNw%3D%3D; path=/; HttpOnly; SameSite=Lax
Cache-Control: no-cache
X-Request-Id: 84bae277-3507-48b4-b61f-51363058f6e6
X-Runtime: 0.466036
Server-Timing: sql.active_record;dur=8.88, start_processing.action_controller;dur=0.01, process_action.action_controller;dur=18.36
Vary: Origin

3. 请求HTML格式 #

请求命令：

curl -i http://localhost:3000/feeds/zillow

响应结果：

HTTP/1.1 204 No Content
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 0
X-Content-Type-Options: nosniff
X-Download-Options: noopen
X-Permitted-Cross-Domain-Policies: none
Referrer-Policy: strict-origin-when-cross-origin
Set-Cookie: _session_id=YDL5FHg4A4jbIXfqTz6kw6FSyVOLfkDd9l7r6kdMMicqtZJRW4ggkULeTu5Nv6RJpNH36TLxIHdTp6%2BxQV6PKGLTR30IyamNzjMUij2IJKhBi%2B8aMsk6fzR4HNpjmQ%2Fh0pIVJvtX7JD25ROWDPbp4Ay6Y22BDSSLpvLApMWvFlTxeOQ%3D--nVZ3vQfPxCDfn%2BO2--yjA0VUMoEvACtvzROGzQ9Q%3D%3D; path=/; HttpOnly; SameSite=Lax
Cache-Control: no-cache
X-Request-Id: 036d1ad5-1b7c-4d45-929b-9d676eb02092
X-Runtime: 0.012600
Server-Timing: start_processing.action_controller;dur=0.01, process_action.action_controller;dur=0.52
Vary: Origin

补充说明 #

已确认本地数据库中有符合条件的Listing数据，但无论请求HTML还是RSS格式，都无法正确加载视图内容，恳请帮忙排查问题。

内容的提问来源于stack exchange，提问作者Corey Cramer