Проставляем правильный content_type для svg

lib/paperclip/attachment.rb

@@ -414,7 +414,7 @@ module Paperclip
     end
 
     def post_process #:nodoc:
-      return unless content_type.match(/image/)
+      return if !content_type.include?('image') || content_type.include?('svg')
       return if queued_for_write[:original].nil?
 
       instance.run_paperclip_callbacks(:post_process) do

lib/paperclip/upfile.rb

@@ -20,6 +20,7 @@ module Paperclip
       when %r"html?"                 then "text/html"
       when "csv", "xml", "css", "js" then "text/#{type}"
       when "liquid"                  then "text/x-liquid"
+      when 'svg'                     then 'image/svg+xml'
       else "application/x-#{type}"
       end
     end