1 files changed, 2 insertions, 6 deletions
diff --git a/activerecord/lib/active_record/validations/uniqueness.rb b/activerecord/lib/active_record/validations/uniqueness.rb
index 4f5b157af9..2677fade18 100644
--- a/activerecord/lib/active_record/validations/uniqueness.rb
+++ b/activerecord/lib/active_record/validations/uniqueness.rb
@@ -67,22 +67,18 @@ module ActiveRecord
         end
 
         attribute_name = attribute.to_s
+        value = klass.predicate_builder.build_bind_attribute(attribute_name, value)
 
         table = klass.arel_table
         column = klass.columns_hash[attribute_name]
-        cast_type = klass.type_for_attribute(attribute_name)
 
-        value = Relation::QueryAttribute.new(attribute_name, value, cast_type)
         comparison = if !options[:case_sensitive]
           # will use SQL LOWER function before comparison, unless it detects a case insensitive collation
           klass.connection.case_insensitive_comparison(table, attribute, column, value)
         else
           klass.connection.case_sensitive_comparison(table, attribute, column, value)
         end
-        klass.unscoped.tap do |scope|
-          parts = [comparison]
-          scope.where_clause += Relation::WhereClause.new(parts)
-        end
+        klass.unscoped.where!(comparison)
       end
 
       def scope_relation(record, relation)