Carrierwave deprecation moving towards ActiveStorage through paperclip

app/models/dunlop/source_file_uploader.rb

@@ -1,21 +1,23 @@
 # encoding: utf-8
 
-class Dunlop::SourceFileUploader < CarrierWave::Uploader::Base
+if defined?(CarrierWave)
+  class Dunlop::SourceFileUploader < CarrierWave::Uploader::Base
 
-  #storage :file
+    #storage :file
 
-  # Override the directory where uploaded files will be stored.
+    # Override the directory where uploaded files will be stored.
-  # This is a sensible default for uploaders that are meant to be mounted:
+    # This is a sensible default for uploaders that are meant to be mounted:
-  def store_dir
+    def store_dir
-    File.join(
+      File.join(
-      Rails.application.config.file_storage_path,
+        Rails.application.config.file_storage_path,
-      model.class.to_s.underscore,
+        model.class.to_s.underscore,
-      mounted_as.to_s,
+        mounted_as.to_s,
-      model.id.to_s
+        model.id.to_s
-    )
+      )
-  end
+    end
 
-  def original_filename
+    def original_filename
-    File.basename(path.to_s)
+      File.basename(path.to_s)
+    end
   end
 end

app/models/dunlop/target_file_uploader.rb

@@ -1,21 +1,22 @@
 # encoding: utf-8
+if defined?(CarrierWave)
+  class Dunlop::TargetFileUploader < CarrierWave::Uploader::Base
 
-class Dunlop::TargetFileUploader < CarrierWave::Uploader::Base
+    storage :file
 
-  storage :file
+    # Override the directory where uploaded files will be stored.
+    # This is a sensible default for uploaders that are meant to be mounted:
+    def store_dir
+      File.join(
+        Rails.application.config.file_storage_path,
+        model.class.to_s.underscore,
+        mounted_as.to_s,
+        model.id.to_s
+      )
+    end
 
-  # Override the directory where uploaded files will be stored.
+    def original_filename
-  # This is a sensible default for uploaders that are meant to be mounted:
+      File.basename(path.to_s)
-  def store_dir
+    end
-    File.join(
-      Rails.application.config.file_storage_path,
-      model.class.to_s.underscore,
-      mounted_as.to_s,
-      model.id.to_s
-    )
-  end
-
-  def original_filename
-    File.basename(path.to_s)
   end
 end

dunlop-core.gemspec

@@ -24,7 +24,6 @@ Gem::Specification.new do |s|
   s.add_dependency 'responders'
   s.add_dependency 'redcarpet'
   s.add_dependency 'state_machines-activerecord'
-  s.add_dependency 'carrierwave'
   s.add_dependency 'simple_form'
   s.add_dependency 'devise'
   s.add_dependency 'devise-token_authenticatable'

lib/dunlop/engine.rb

@@ -16,7 +16,6 @@ require 'ransack'
 require 'devise'
 require 'devise-token_authenticatable'
 require 'state_machines-activerecord'
-require 'carrierwave'
 require 'simple_form'
 require 'redcarpet'
 require 'exception_notification'

spec/dummy/config/environment.rb

@@ -1,7 +1,7 @@
 # Load the Rails application.
 require File.expand_path('../application', __FILE__)
 
-require 'carrierwave/storage/fog'
+#require 'carrierwave/storage/fog'
 
 # Initialize the Rails application.
 Rails.application.initialize!