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.
-  # 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.
+    # 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
 
-  def original_filename
-    File.basename(path.to_s)
+    def original_filename
+      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.
-  # 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
-
-  def original_filename
-    File.basename(path.to_s)
+    def original_filename
+      File.basename(path.to_s)
+    end
   end
 end