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-rw-r--r--activemodel/lib/active_model/observing.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/observing.rb b/activemodel/lib/active_model/observing.rb
index 74a33d45ab..d7e3ca100e 100644
--- a/activemodel/lib/active_model/observing.rb
+++ b/activemodel/lib/active_model/observing.rb
@@ -2,6 +2,7 @@ require 'singleton'
require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/module/aliasing'
require 'active_support/core_ext/string/inflections'
+require 'active_support/core_ext/string/conversions'
module ActiveModel
module Observing