Heroku Application Error "App Crashed!"

Question

前提・実現したいこと

gem Cloudinaryを追加してHerokuにデプロイ
実行環境は Rails5.2　加えてCarrierwave RMagick Minimagickがgemに存在。

発生している問題・エラーメッセージ

2018-08-19T11:04:06.504730+00:00 app[web.1]: /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:53:in `block in load_missing_constant': uninitialized constant ImageUploader::Cloudinary (NameError)
2018-08-19T11:04:06.504835+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:8:in `without_bootsnap_cache'
2018-08-19T11:04:06.504866+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:53:in `rescue in load_missing_constant'
2018-08-19T11:04:06.504888+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:42:in `load_missing_constant'
2018-08-19T11:04:06.504908+00:00 app[web.1]: from /app/app/uploaders/image_uploader.rb:3:in `<class:ImageUploader>'
2018-08-19T11:04:06.504927+00:00 app[web.1]: from /app/app/uploaders/image_uploader.rb:1:in `<main>'
2018-08-19T11:04:06.504946+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
2018-08-19T11:04:06.504966+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
2018-08-19T11:04:06.504985+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
2018-08-19T11:04:06.505005+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
2018-08-19T11:04:06.505025+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
2018-08-19T11:04:06.505064+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.1/lib/active_support/concurrency/share_lock.rb:151:in `exclusive'
2018-08-19T11:04:06.505045+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.1/lib/active_support/dependencies/interlock.rb:14:in `block in loading'
2018-08-19T11:04:06.505084+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.1/lib/active_support/dependencies/interlock.rb:13:in `loading'
2018-08-19T11:04:06.505104+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:43:in `load_missing_constant'
2018-08-19T11:04:06.505123+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:43:in `load_missing_constant'
2018-08-19T11:04:06.505162+00:00 app[web.1]: from /app/app/models/item.rb:1:in `<main>'
2018-08-19T11:04:06.505143+00:00 app[web.1]: from /app/app/models/item.rb:8:in `<class:Item>'
2018-08-19T11:04:06.505201+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
2018-08-19T11:04:06.505182+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
2018-08-19T11:04:06.505220+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
2018-08-19T11:04:06.505239+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
2018-08-19T11:04:06.505258+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
2018-08-19T11:04:06.505278+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.1/lib/active_support/dependencies/interlock.rb:14:in `block in loading'
2018-08-19T11:04:06.505297+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.1/lib/active_support/concurrency/share_lock.rb:151:in `exclusive'
2018-08-19T11:04:06.505316+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.1/lib/active_support/dependencies/interlock.rb:13:in `loading'
2018-08-19T11:04:06.505335+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:59:in `depend_on'
2018-08-19T11:04:06.505355+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/engine.rb:478:in `block (2 levels) in eager_load!'
2018-08-19T11:04:06.505373+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/engine.rb:477:in `each'
2018-08-19T11:04:06.505403+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/engine.rb:477:in `block in eager_load!'
2018-08-19T11:04:06.505425+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/engine.rb:475:in `each'
2018-08-19T11:04:06.505444+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/engine.rb:475:in `eager_load!'
2018-08-19T11:04:06.505464+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/engine.rb:356:in `eager_load!'
2018-08-19T11:04:06.505503+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
2018-08-19T11:04:06.505483+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/application/finisher.rb:69:in `each'
2018-08-19T11:04:06.505522+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/initializable.rb:32:in `instance_exec'
2018-08-19T11:04:06.505560+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/initializable.rb:61:in `block in run_initializers'
2018-08-19T11:04:06.505579+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:228:in `block in tsort_each'
2018-08-19T11:04:06.505541+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/initializable.rb:32:in `run'
2018-08-19T11:04:06.505599+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
2018-08-19T11:04:06.505618+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:431:in `each_strongly_connected_component_from'
2018-08-19T11:04:06.505637+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:349:in `block in each_strongly_connected_component'
2018-08-19T11:04:06.505656+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:347:in `each'
2018-08-19T11:04:06.505675+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:347:in `call'
2018-08-19T11:04:06.505694+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:347:in `each_strongly_connected_component'
2018-08-19T11:04:06.505713+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:226:in `tsort_each'
2018-08-19T11:04:06.505733+00:00 app[web.1]: from /app/vendor/ruby-2.5.1/lib/ruby/2.5.0/tsort.rb:205:in `tsort_each'
2018-08-19T11:04:06.505752+00:00 app[web.1]: from /app/vendor/bundle/ruby/2.5.0/gems/railties-5.2.1/lib/rails/initializable.rb:60:in `run_initializers'

先頭部分より

 /app/vendor/bundle/ruby/2.5.0/gems/bootsnap-1.3.1/lib/bootsnap/load_path_cache/core_ext/active_support.rb:53:in `block in load_missing_constant': uninitialized constant ImageUploader::Cloudinary (NameError)

定義されていないImageUploader::Cloudinaryが原因のようです。

該当のソースコード

image_uploader.rb
class ImageUploader < CarrierWave::Uploader::Base
  if Rails.env.production?
    include Cloudinary::CarrierWave
    process :convert => 'png'
    process :tags => ['image']

    version :standard do
    process :resize_to_fill => [100, 150, :north]
    end

    version :thumbnail do
    process :resize_to_fit => [50, 50]
    end

    def public_id
      return model.id
    end

  else
    include CarrierWave::RMagick
    process resize_to_fill: [128,128]
    storage :file
    # アップロードファイルの保存先ディレクトリは上書き可能
    # 下記はデフォルトの保存先
    def store_dir
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
    end
    # アップロード可能な拡張子のリスト
    def extension_white_list
      %w(jpg jpeg gif png)
    end
  end
end

_form.html.erb
<div class="field">
    <%= form.label :image %>
    <%= form.file_field :image %>
    <%= form.file_field :image, id: :items_image_path %>
  </div>

item.rb
class Item < ApplicationRecord
	  # validates :name, presence: true
		# validates :description, presence: true
		# validates :price, presence:true

		#for carrierwave to upload images

		mount_uploader :image, ImageUploader

		validate :add_error_sample

  	def add_error_sample
    # nameが空のときにエラーメッセージを追加する
	    if name.blank?
	      errors[:base] << "商品名は必ず入力して下さい"
	    end

	    if description.blank?
	      errors[:base] << "説明文は必ず入力して下さい"
	    end

	    # 価格が空のときにエラーメッセージを追加する
	    if price.blank?
	      errors[:base] << "価格は必ず入力して下さい"
	    end
  	end
end

試したこと

Qiitaにてまとめました
およそググって調べられるものは、Cloudinaryの追加段階でもエラーの連続でしたので試してみましたが解決には至りませんでした。

補足情報（FW/ツールのバージョンなど）

Rails5.2

Answer 1

自己解決しました。
肝心な、Gemfileの記述がありませんでした・・！
複数のエディタで別作業を行っていたのが原因です。お騒がせしました！