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-rw-r--r--activesupport/lib/active_support/ordered_hash.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/ordered_hash.rb b/activesupport/lib/active_support/ordered_hash.rb
index eda33f827e..b721e6f70a 100644
--- a/activesupport/lib/active_support/ordered_hash.rb
+++ b/activesupport/lib/active_support/ordered_hash.rb
@@ -131,7 +131,7 @@ module ActiveSupport
def merge!(other_hash)
if block_given?
- other_hash.each {|k,v| self[k] = yield(k, self[k], v) }
+ other_hash.each {|k,v| self[k] = yield(k, self[k], v) if key? k}
else
other_hash.each {|k,v| self[k] = v }
end