2 files changed, 15 insertions, 1 deletions
diff --git a/activestorage/lib/active_storage/attached/changes/create_many.rb b/activestorage/lib/active_storage/attached/changes/create_many.rb
index af19328a61..a7a8553e0f 100644
--- a/activestorage/lib/active_storage/attached/changes/create_many.rb
+++ b/activestorage/lib/active_storage/attached/changes/create_many.rb
@@ -21,7 +21,8 @@ module ActiveStorage
     end
 
     def save
-      record.public_send("#{name}_attachments=", attachments)
+      assign_associated_attachments
+      reset_associated_blobs
     end
 
     private
@@ -32,5 +33,14 @@ module ActiveStorage
       def build_subchange_from(attachable)
         ActiveStorage::Attached::Changes::CreateOneOfMany.new(name, record, attachable)
       end
+
+
+      def assign_associated_attachments
+        record.public_send("#{name}_attachments=", attachments)
+      end
+
+      def reset_associated_blobs
+        record.public_send("#{name}_blobs").reset
+      end
   end
 end
diff --git a/activestorage/lib/active_storage/attached/changes/delete_many.rb b/activestorage/lib/active_storage/attached/changes/delete_many.rb
index 5c7fe385de..6cbd1158dc 100644
--- a/activestorage/lib/active_storage/attached/changes/delete_many.rb
+++ b/activestorage/lib/active_storage/attached/changes/delete_many.rb
@@ -12,6 +12,10 @@ module ActiveStorage
       ActiveStorage::Attachment.none
     end
 
+    def blobs
+      ActiveStorage::Blob.none
+    end
+
     def save
       record.public_send("#{name}_attachments=", [])
     end