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-rw-r--r--activerecord/lib/active_record/base.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index c918e88590..4b66d8cd36 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1,5 +1,4 @@
require 'yaml'
-require 'set'
require 'active_support/benchmarkable'
require 'active_support/dependencies'
require 'active_support/descendants_tracker'
@@ -280,6 +279,7 @@ module ActiveRecord #:nodoc:
extend Explain
extend Enum
extend Delegation::DelegateCache
+ extend CollectionCacheKey
include Core
include Persistence