Merge pull request #1962 from koic/fix_an_error_when_writing_lobs

Fix an error when writing lobs

lib/active_record/connection_adapters/oracle_enhanced/database_statements.rb

@@ -252,7 +252,7 @@ def write_lobs(table_name, klass, attributes, columns) #:nodoc:
               value = klass.attribute_types[col.name].serialize(value)
             end
             uncached do
-              unless lob_record = select_one(<<~SQL.squish, "Writable Large Object")
+              unless lob_record = select_one(sql = <<~SQL.squish, "Writable Large Object")
                 SELECT #{quote_column_name(col.name)} FROM #{quote_table_name(table_name)}
                 WHERE #{quote_column_name(klass.primary_key)} = #{id} FOR UPDATE
               SQL