instance method validate_configuration!

# File activerecord/lib/active_record/database_configurations/hash_config.rb, line 214
        def validate_configuration!
          if configuration_hash[:pool] && configuration_hash[:max_connections]
            pool_val = configuration_hash[:pool].to_i
            max_conn_val = configuration_hash[:max_connections].to_i

            if pool_val != max_conn_val
              raise "Ambiguous configuration: 'pool' (#{pool_val}) and 'max_connections' (#{max_conn_val}) are set to different values. Prefer just 'max_connections'."
            end
          end

          if configuration_hash[:pool] && configuration_hash[:min_connections]
            raise "Ambiguous configuration: when setting 'min_connections', use 'max_connections' instead of 'pool'."
          end
        end