Remove fast_destroy_uploads feature flag

Fast destroy of uploads was successfully enabled and test.

app/models/concerns/with_uploads.rb

@@ -27,40 +27,14 @@ module WithUploads
 
   included do
     has_many :uploads, as: :model
-    has_many :file_uploads, -> { where(uploader: FILE_UPLOADERS) }, class_name: 'Upload', as: :model
+    has_many :file_uploads, -> { where(uploader: FILE_UPLOADERS) },
+      class_name: 'Upload', as: :model,
+      dependent: :delete_all # rubocop:disable Cop/ActiveRecordDependent
 
-    # TODO: when feature flag is removed, we can use just dependent: destroy
-    # option on :file_uploads
-    before_destroy :remove_file_uploads
-
-    use_fast_destroy :file_uploads, if: :fast_destroy_enabled?
+    use_fast_destroy :file_uploads
   end
 
   def retrieve_upload(_identifier, paths)
     uploads.find_by(path: paths)
   end
-
-  private
-
-  # mounted uploads are deleted in carrierwave's after_commit hook,
-  # but FileUploaders which are not mounted must be deleted explicitly and
-  # it can not be done in after_commit because FileUploader requires loads
-  # associated model on destroy (which is already deleted in after_commit)
-  def remove_file_uploads
-    fast_destroy_enabled? ? delete_uploads : destroy_uploads
-  end
-
-  def delete_uploads
-    file_uploads.delete_all(:delete_all)
-  end
-
-  def destroy_uploads
-    file_uploads.find_each do |upload|
-      upload.destroy
-    end
-  end
-
-  def fast_destroy_enabled?
-    Feature.enabled?(:fast_destroy_uploads, self)
-  end
 end

changelogs/unreleased/fast-destroy-uploads.yml

+---
+title: File uploads are deleted asynchronously when deleting a project or group.
+merge_request:
+author:
+type: added

spec/support/shared_examples/models/with_uploads_shared_examples.rb

@@ -44,26 +44,6 @@ shared_examples_for 'model with uploads' do |supports_fileuploads|
           model_object.destroy
         end
       end
-
-      describe 'destroy strategy depending on feature flag' do
-        let!(:upload) { create(:upload, uploader: FileUploader, model: model_object) }
-
-        it 'does not destroy uploads by default' do
-          expect(model_object).to receive(:delete_uploads)
-          expect(model_object).not_to receive(:destroy_uploads)
-
-          model_object.destroy
-        end
-
-        it 'uses before destroy callback if feature flag is disabled' do
-          stub_feature_flags(fast_destroy_uploads: false)
-
-          expect(model_object).to receive(:destroy_uploads)
-          expect(model_object).not_to receive(:delete_uploads)
-
-          model_object.destroy
-        end
-      end
     end
   end
 end