From e4c51864286e790ba1cdec1e05fe8fadfb42330b Mon Sep 17 00:00:00 2001
From: George Claghorn <george@basecamp.com>
Date: Mon, 23 Apr 2018 16:42:47 -0500
Subject: Flush tempfile after populating it

Ensure that other processes like ImageMagick and FFmpeg see the complete contents of the file.
---
 activestorage/lib/active_storage/downloading.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/activestorage/lib/active_storage/downloading.rb b/activestorage/lib/active_storage/downloading.rb
index f2a1fffdcb..7c3d20ade0 100644
--- a/activestorage/lib/active_storage/downloading.rb
+++ b/activestorage/lib/active_storage/downloading.rb
@@ -27,6 +27,7 @@ module ActiveStorage
       def download_blob_to(file) #:doc:
         file.binmode
         blob.download { |chunk| file.write(chunk) }
+        file.flush
         file.rewind
       end
 
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