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-rw-r--r--activemodel/lib/active_model/dirty.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb
index 3b412d3dd7..166cccf161 100644
--- a/activemodel/lib/active_model/dirty.rb
+++ b/activemodel/lib/active_model/dirty.rb
@@ -156,7 +156,7 @@ module ActiveModel
rescue TypeError, NoMethodError
end
- changed_attributes[attr] = value
+ changed_attributes[attr] = value unless changed_attributes.include?(attr)
end
# Handle <tt>reset_*!</tt> for +method_missing+.