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-rw-r--r--activemodel/lib/active_model/validations.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations.rb b/activemodel/lib/active_model/validations.rb
index 3407c59e7a..37429f2bb8 100644
--- a/activemodel/lib/active_model/validations.rb
+++ b/activemodel/lib/active_model/validations.rb
@@ -2,6 +2,7 @@ require 'active_support/core_ext/array/extract_options'
require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/hash/keys'
+require 'active_support/core_ext/hash/except'
require 'active_model/errors'
require 'active_model/validations/callbacks'