Error while iterating on `Predis\Client`: `Object of class Predis\Connection\Aggregate\MasterSlaveReplication could not be converted to string`

Author: Gregoire-MCreated Jan 6, 2023Updated Mar 11, 2025

Labelsbug

Describe the bug I get a fatal error when iterating on a Predis\Client instance which connection is a Predis\Connection\Aggregate\MasterSlaveReplication instance.

To Reproduce With snc/redis-bundle 4.4.2 and predis/predis 1.1.10, Symfony 5.4.16, and php 8.1.11 and the following config:

yaml

snc_redis:
    clients:
        default:
            type: predis
            alias: default
            dsn:
                - "%env(REDIS_URL)%?alias=master"
                - "%env(REDIS_URL_READ_ONLY)%"
            logging: '%kernel.debug%'
            options:
                replication: true

Then run:

$ bin/console redis:query flushall -vvv

In Client.php line 540:

  [Error]
  Object of class Predis\Connection\Aggregate\MasterSlaveReplication could not be converted to string


Exception trace:
  at /srv/app/vendor/predis/predis/src/Client.php:540
 Predis\Client->getIterator() at /srv/app/vendor/snc/redis-bundle/src/Command/RedisQueryCommand.php:86
 Snc\RedisBundle\Command\RedisQueryCommand->execute() at /srv/app/vendor/symfony/console/Command/Command.php:312
 Symfony\Component\Console\Command\Command->run() at /srv/app/vendor/symfony/console/Application.php:1038
 Symfony\Component\Console\Application->doRunCommand() at /srv/app/vendor/symfony/framework-bundle/Console/Application.php:96
 Symfony\Bundle\FrameworkBundle\Console\Application->doRunCommand() at /srv/app/vendor/symfony/console/Application.php:312
 Symfony\Component\Console\Application->doRun() at /srv/app/vendor/symfony/framework-bundle/Console/Application.php:82
 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at /srv/app/vendor/symfony/console/Application.php:168
 Symfony\Component\Console\Application->run() at /srv/app/bin/console:43

redis:query [--client CLIENT] [--] <query>...

Expected behavior It should output:

DEBUG     [snc_redis] Executing command "FLUSHALL"
^ Predis\Response\Status^ {#389
  -payload: "OK"
}

Versions (please complete the following information):

Predis: 1.1.10
snc/redis-bundle 4.4.2
Symfony 5.4.16
PHP 8.1.11
Redis Server: bitnami/redis:6.2.6

Code sample The code that tries to iterate on the client is here.

Additional context N/A

Source: predis/predis

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