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-rw-r--r--activerecord/lib/active_record/validations/uniqueness.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index edec4e9e43..711086dc2c 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -119,7 +119,7 @@ module ActiveRecord
comparison_operator = "IS ?"
elsif column.text?
comparison_operator = "#{connection.case_sensitive_equality_operator} ?"
- value = column.limit ? value.to_s[0, column.limit] : value.to_s
+ value = column.limit ? value.to_s.mb_chars[0, column.limit] : value.to_s
else
comparison_operator = "= ?"
end