From 19c97c7e35c1d1acbdfd8fd1abac36c1495ef78a Mon Sep 17 00:00:00 2001
From: "M.Shibuya" <mit.shibuya@gmail.com>
Date: Tue, 18 Jun 2019 16:40:08 +0900
Subject: [PATCH] Allow deleting all files for multiple file upload. Fixes
 #1990

---
 lib/carrierwave/mounter.rb  |  2 +-
 spec/mount_multiple_spec.rb | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/carrierwave/mounter.rb b/lib/carrierwave/mounter.rb
index 6b18fdccf..2ebe89dea 100644
--- a/lib/carrierwave/mounter.rb
+++ b/lib/carrierwave/mounter.rb
@@ -41,7 +41,7 @@ def uploaders
     end
 
     def cache(new_files)
-      return if new_files.blank?
+      return if !new_files.is_a?(Array) && new_files.blank?
       old_uploaders = uploaders
       @uploaders = new_files.map do |new_file|
         handle_error do
diff --git a/spec/mount_multiple_spec.rb b/spec/mount_multiple_spec.rb
index eea5435fd..20725b315 100644
--- a/spec/mount_multiple_spec.rb
+++ b/spec/mount_multiple_spec.rb
@@ -309,6 +309,16 @@ def monkey
           expect { instance.store_images! }.not_to raise_error
           expect(instance.images.map(&:identifier)).to be_empty
         end
+
+        it "allows deleting all files" do
+          instance.images = []
+          expect(instance.images.map(&:identifier)).to be_empty
+        end
+
+        it "allows assignment of uploader instances" do
+          instance.images = [instance.images[0]]
+          expect(instance.images.map(&:identifier)).to eq ['bork.txt']
+        end
       end
     end