From d95de0906c1d1c0a5ea07ad9c258f5755feb2e6d Mon Sep 17 00:00:00 2001
From: Jared Beck <jared@jaredbeck.com>
Date: Tue, 7 Mar 2017 13:23:51 -0500
Subject: [PATCH] Fix error calling private method in rails 4.0

---
 CHANGELOG.md                    | 2 ++
 lib/paper_trail/record_trail.rb | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8641abe5..f80bf631 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,8 @@ recommendations of [keepachangelog.com](http://keepachangelog.com/).
 
 - [#925](https://github.com/airblade/paper_trail/pull/925) - Update RSpec
   matchers to work with custom version association names
+- [#929](https://github.com/airblade/paper_trail/pull/929) -
+  Fix error calling private method in rails 4.0
 
 ## 6.0.2 (2016-12-13)
 
diff --git a/lib/paper_trail/record_trail.rb b/lib/paper_trail/record_trail.rb
index cec29cfe..b0f5f97e 100644
--- a/lib/paper_trail/record_trail.rb
+++ b/lib/paper_trail/record_trail.rb
@@ -474,7 +474,9 @@ module PaperTrail
       if @in_after_callback && RAILS_GTE_5_1
         @record.attribute_before_last_save(attr_name.to_s)
       else
-        @record.attribute_was(attr_name.to_s)
+        # TODO: after dropping support for rails 4.0, remove send, because
+        # attribute_was is no longer private.
+        @record.send(:attribute_was, attr_name.to_s)
       end
     end