Slave Okay Queries

Note

slaveOkay was deprecated in 1.2 - please use Read Preference instead.

Documents

You can configure an entire document to send all reads to the slaves by using the slaveOkay flag:

<?php

/** @Document(slaveOkay=true) */
class User
{
    /** @Id */
    private $id;
}

Now all reads involving the User document will be sent to a slave.

Queries

If you want to instruct individual queries to read from a slave you can use the slaveOkay() method on the query builder.

<?php

$qb = $dm->createQueryBuilder('User')
    ->slaveOkay(true);
$query = $qb->getQuery();
$users = $query->execute();

The data in the query above will be read from a slave. Even if you have a @ReferenceOne or @ReferenceMany resulting from the query above it will be initialized and loaded from a slave.

<?php

/** @Document */
class User
{
    /** @ReferenceMany(targetDocument="Account") */
    private $accounts;
}

Now when you query and iterate over the accounts, they will be loaded from a slave:

<?php

$qb = $dm->createQueryBuilder('User')
    ->slaveOkay(true);
$query = $qb->getQuery();
$users = $query->execute();

foreach ($users as $user) {
    foreach ($user->getAccounts() as $account) {
        echo $account->getName();
    }
}

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