extract_precision

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 185
        def extract_precision(sql_type)
          if sql_type == 'money'
            self.class.money_precision
          elsif sql_type =~ /timestamp/
            $1.to_i if sql_type =~ /\((\d+)\)/
          else
            super
          end
        end