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-rw-r--r--activemodel/lib/active_model/attribute_mutation_tracker.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activemodel/lib/active_model/attribute_mutation_tracker.rb b/activemodel/lib/active_model/attribute_mutation_tracker.rb
index 82d90664c0..6abf37bd44 100644
--- a/activemodel/lib/active_model/attribute_mutation_tracker.rb
+++ b/activemodel/lib/active_model/attribute_mutation_tracker.rb
@@ -27,7 +27,7 @@ module ActiveModel
attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
change = change_to_attribute(attr_name)
if change
- result[attr_name] = change
+ result.merge!(attr_name => change)
end
end
end