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-rw-r--r--activerecord/lib/active_record/persistence.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index 42cece3ad0..59f8e90e7a 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -51,7 +51,7 @@ module ActiveRecord
# how this "single-table" inheritance mapping is implemented.
def instantiate(record, column_types = {})
klass = discriminate_class_for_record(record)
- column_types = klass.decorate_columns(column_types)
+ column_types = klass.decorate_columns(column_types.dup)
klass.allocate.init_with('attributes' => record, 'column_types' => column_types)
end