instance method translate_exception

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 420
        def translate_exception(exception, message)
          return exception unless exception.respond_to?(:result)

          case exception.result.try(:error_field, PG::PG_DIAG_SQLSTATE)
          when UNIQUE_VIOLATION
            RecordNotUnique.new(message)
          when FOREIGN_KEY_VIOLATION
            InvalidForeignKey.new(message)
          when VALUE_LIMIT_VIOLATION
            ValueTooLong.new(message)
          when NUMERIC_VALUE_OUT_OF_RANGE
            RangeError.new(message)
          when NOT_NULL_VIOLATION
            NotNullViolation.new(message)
          when SERIALIZATION_FAILURE
            SerializationFailure.new(message)
          when DEADLOCK_DETECTED
            Deadlocked.new(message)
          when LOCK_NOT_AVAILABLE
            LockWaitTimeout.new(message)
          when QUERY_CANCELED
            QueryCanceled.new(message)
          else
            super
          end
        end