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-rw-r--r--activerecord/lib/active_record/aggregations.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/aggregations.rb b/activerecord/lib/active_record/aggregations.rb
index 6141d2d535..208dc35321 100644
--- a/activerecord/lib/active_record/aggregations.rb
+++ b/activerecord/lib/active_record/aggregations.rb
@@ -1,5 +1,10 @@
module ActiveRecord
module Aggregations # :nodoc:
+ def self.append_features(base)
+ super
+ base.extend(ClassMethods)
+ end
+
# Active Record implements aggregation through a macro-like class method called +composed_of+ for representing attributes
# as value objects. It expresses relationships like "Account [is] composed of Money [among other things]" or "Person [is]
# composed of [an] address". Each call to the macro adds a description on how the value objects are created from the