FIX: uploads:backfill_shas rake task

lib/tasks/uploads.rake

@@ -6,21 +6,19 @@ require "digest/sha1"
 
 task "uploads:backfill_shas" => :environment do
   RailsMultisite::ConnectionManagement.each_connection do |db|
-    puts "Backfilling #{db}"
-    Upload.select([:id, :sha, :url]).find_each do |u|
-      if u.sha.nil?
-        putc "."
-        path = "#{Rails.root}/public/#{u.url}"
-        sha = Digest::SHA1.file(path).hexdigest
+    puts "Backfilling #{db}..."
+    Upload.where(sha1: nil).find_each do |u|
       begin
-          Upload.update_all ["sha = ?", sha], ["id = ?", u.id]
-        rescue ActiveRecord::RecordNotUnique
-          # not a big deal if we've got a few duplicates
+        path = Discourse.store.path_for(u)
+        u.sha1 = Digest::SHA1.file(path).hexdigest
+        u.save!
+        putc "."
+      rescue Errno::ENOENT
+        putc "X"
       end
     end
   end
-  end
-  puts "done"
+  puts "", "Done"
 end
 
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