translate_exception

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 1091
        def translate_exception(exception, message)
          case exception.message
          when /duplicate key value violates unique constraint/
            RecordNotUnique.new(message, exception)
          when /violates foreign key constraint/
            InvalidForeignKey.new(message, exception)
          else
            super
          end
        end