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-rwxr-xr-xactiverecord/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 0a81681126..1583c28efe 100755
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1022,7 +1022,7 @@ module ActiveRecord #:nodoc:
# Merges includes so that the result is a valid +include+
def merge_includes(first, second)
- safe_to_array(first) + safe_to_array(second)
+ (safe_to_array(first) + safe_to_array(second)).uniq
end
# Object#to_a is deprecated, though it does have the desired behavior