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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 2e2ea8c42b..d56248b928 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -54,7 +54,7 @@ module ActiveRecord
def build_relation(klass, table, attribute, value) #:nodoc:
column = klass.columns_hash[attribute.to_s]
- value = column.limit ? value.to_s.mb_chars[0, column.limit] : value.to_s if column.text?
+ value = column.limit ? value.to_s[0, column.limit] : value.to_s if column.text?
if !options[:case_sensitive] && value && column.text?
# will use SQL LOWER function before comparison, unless it detects a case insensitive collation