【Rails】「 render :nothing => true 」が効かない

rails、herokuを用いてLINEBOTを作成しようとしております。
heroku run rails consoleをすると正常に動くのですが、実際にLINEで話し掛けると
どうも上手くいかないためherokuにてログを参照したところ、以下のようなActionViewエラーが出ます。

Completed 500 Internal Server Error in 8ms
ActionView::MissingTemplate (Missing template webhook/callback, application/callback with {:locale=>[:en], :formats=>[:html, :text, :js, :css, :ics, :csv, :vcf, :png, :jpeg, :gif, :bmp, :tiff, :svg, :mpeg, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json, :pdf, :zip, :gzip], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :coffee, :jbuilder]}. Searched in:
 * "/app/app/views"
):
app/controllers/webhook_controller.rb:10:in `callback'

callbackアクションに対して表示するviewがないよ！と言ってそうな気がしますが、webhookコントローラー内callbackアクションにて「render :nothing => true」で何も表示しないと指定しています。
その後の「application/callback」がミソのような気がしますが、applicationコントローラーにはcallbackアクションは無い・・・と、ここで詰まっております。
「render :nothing => true」が効かない条件がコントローラー内にあるのでしょうか？
また、「app/controllers/webhook_controller.rb:10:in `callback'」もヒントになるような気はするのですが、わからずじまいです。（webhookコントローラーの10行目にrender :nothing => trueを書いてる）

(追記)もしかしてcallback内に「render :nothing => true」が2つあるのが問題かと思いましたが、and returnを入れても変化なかったので違いそうです。

以下にherokuのログと、コントローラー(webhook_controller.rb)、routes.rbのコードを投げておきます。
（コントローラーはこちらを参考にしております（https://qiita.com/YoheiMiyamoto/items/f6851cdb40891edf0e57））

lang
1class WebhookController < ApplicationController
2  protect_from_forgery except: :callback
3
4  CHANNEL_SECRET = ENV['CHANNEL_SECRET']
5  OUTBOUND_PROXY = ENV['OUTBOUND_PROXY']
6  CHANNEL_ACCESS_TOKEN = ENV['CHANNEL_ACCESS_TOKEN']
7
8  def callback
9    unless is_validate_signature
10      render :nothing => true, status: 470
11    end
12
13    event = params["events"][0]
14    event_type = event["type"]
15    replyToken = event["replyToken"]
16
17    case event_type
18    when "message"
19      input_text = event["message"]["text"]
20      output_text = input_text
21    end
22
23    client = LineClient.new(CHANNEL_ACCESS_TOKEN, OUTBOUND_PROXY)
24    res = client.reply(replyToken, output_text)
25
26    if res.status == 200
27      logger.info({success: res})
28    else
29      logger.info({fail: res})
30    end
31
32    render :nothing => true, status: :ok
33  end
34
35  private
36  # verify access from LINE
37  def is_validate_signature
38    signature = request.headers["X-LINE-Signature"]
39    http_request_body = request.raw_post
40    hash = OpenSSL::HMAC::digest(OpenSSL::Digest::SHA256.new, CHANNEL_SECRET, http_request_body)
41    signature_answer = Base64.strict_encode64(hash)
42    signature == signature_answer
43  end
44end

#routes.rb
Rails.application.routes.draw do
  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html

  post '/callback' => 'webhook#callback'

end

2017-10-10T12:52:52.629674+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07] Started POST "/callback" for 203.104.156.75 at 2017-10-10 12:52:52 +0000
2017-10-10T12:52:52.634068+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07] Processing by WebhookController#callback as HTML
2017-10-10T12:52:52.634233+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07]   Parameters: {"events"=>[{"replyToken"=>"***", "type"=>"message", "timestamp"=>***, "source"=>{"type"=>"user", "userId"=>"***"}, "message"=>{"id"=>"***", "type"=>"text", "text"=>"Hello, world"}}, {"replyToken"=>"***", "type"=>"message", "timestamp"=>***, "source"=>{"type"=>"user", "userId"=>"***"}, "message"=>{"id"=>"***", "type"=>"sticker", "packageId"=>"1", "stickerId"=>"1"}}], "webhook"=>{"events"=>[{"replyToken"=>"***", "type"=>"message", "timestamp"=>***, "source"=>{"type"=>"user", "userId"=>"***"}, "message"=>{"id"=>"***", "type"=>"text", "text"=>"Hello, world"}}, {"replyToken"=>"***", "type"=>"message", "timestamp"=>***, "source"=>{"type"=>"user", "userId"=>"***"}, "message"=>{"id"=>"***", "type"=>"sticker", "packageId"=>"1", "stickerId"=>"1"}}]}}
2017-10-10T12:52:52.642587+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07] Can't verify CSRF token authenticity.
2017-10-10T12:52:52.644502+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07] Completed 500 Internal Server Error in 10ms
2017-10-10T12:52:52.645073+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07]   
2017-10-10T12:52:52.645114+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07] ActionView::MissingTemplate (Missing template webhook/callback, application/callback with {:locale=>[:en], :formats=>[:html], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :coffee, :jbuilder]}. Searched in:
2017-10-10T12:52:52.645116+00:00 app[web.1]:   * "/app/app/views"
2017-10-10T12:52:52.645162+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07]   
2017-10-10T12:52:52.645116+00:00 app[web.1]: ):
2017-10-10T12:52:52.645209+00:00 app[web.1]: [b6566130-8446-4c9b-8b6c-b6d653fb0c07] app/controllers/webhook_controller.rb:10:in `callback'
2017-10-10T12:53:32.725642+00:00 heroku[router]: at=info method=POST path="/callback" host=***.herokuapp.com request_id=f8695c6b-0fc7-44a7-966a-65b353dcf3d2 fwd="203.104.146.154" dyno=web.1 connect=1ms service=16ms status=500 bytes=1827 protocol=https
2017-10-10T12:53:32.711833+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2] Started POST "/callback" for 203.104.146.154 at 2017-10-10 12:53:32 +0000
2017-10-10T12:53:32.713687+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2] Processing by WebhookController#callback as */*
2017-10-10T12:53:32.713835+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2]   Parameters: {"events"=>[{"type"=>"message", "replyToken"=>"***", "source"=>{"userId"=>"***", "type"=>"user"}, "timestamp"=>***, "message"=>{"type"=>"text", "id"=>"***", "text"=>"ぼー"}}], "webhook"=>{"events"=>[{"type"=>"message", "replyToken"=>"***", "source"=>{"userId"=>"***", "type"=>"user"}, "timestamp"=>***, "message"=>{"type"=>"text", "id"=>"***", "text"=>"ぼー"}}]}}
2017-10-10T12:53:32.714357+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2] Can't verify CSRF token authenticity.
2017-10-10T12:53:32.720612+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2] Completed 500 Internal Server Error in 7ms
2017-10-10T12:53:32.721551+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2]   
2017-10-10T12:53:32.721607+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2] ActionView::MissingTemplate (Missing template webhook/callback, application/callback with {:locale=>[:en], :formats=>[:html, :text, :js, :css, :ics, :csv, :vcf, :png, :jpeg, :gif, :bmp, :tiff, :svg, :mpeg, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json, :pdf, :zip, :gzip], :variants=>[], :handlers=>[:raw, :erb, :html, :builder, :ruby, :coffee, :jbuilder]}. Searched in:
2017-10-10T12:53:32.721609+00:00 app[web.1]:   * "/app/app/views"
2017-10-10T12:53:32.721610+00:00 app[web.1]: ):
2017-10-10T12:53:32.721635+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2]   
2017-10-10T12:53:32.721685+00:00 app[web.1]: [f8695c6b-0fc7-44a7-966a-65b353dcf3d2] app/controllers/webhook_controller.rb:10:in `callback'

（補足）herokuログに「Can't verify CSRF token authenticity.」とありますが、CSRFエラーの方は解決しております。

protect_from_forgery except: :callback

でcallbackをよけてあげると通りました。
コードの方は修正してあります。

行動規範の内容に同意します

回答1件

ベストアンサー

こちら参考になりませんか？

The “:nothing” option is deprecated and will be removed in Rails 5.1

投稿2017/10/18 03:51

編集2017/10/18 03:52

Maar

総合スコア48

shi6na

2017/11/01 07:50

反応遅くなってしまいすみません。URL参考に色々調べまして、「render :nothing => true（略）」（二箇所）をそれぞれ「head 470」「head :ok」に変更してみたところ、無事にできました…！！！ rails5.1から:nothingオプション使えないんですね…なるほど… ありがとうございます！！