Q:

Symfony and Doctrine DQL query builder: how to use multiple setParameters inside if condition checks?

Using Symfony and Doctrine with the DQL query builder, I need to optionally add some WHERE conditions with parameters, with some if condition checks.
Pseudo code example:
$qb = $this->getEntityManager()->createQueryBuilder();
$qb = $qb
    ->select('SOMETHING')
    ->from('SOMEWHERE')
    ->where('SOME CONDITIONS');

if ( SOME CHECK ) {
    $qb
        ->andWhere('field1 = :field1')
        ->andWhere('field2 = :field2')
        ->setParameters([
            'field1' => $myFieldValue1,
            'field2' => $myFieldValue2,
        ]);
} else {
    $qb
        ->andWhere('field1 = :field1')
        ->setParameters([
            'field1' => $myOtherFieldValue1,
        ]);
}

Getting errors like:

Invalid parameter number: number of bound variables does not match number of tokens
Too few parameters: the query defines X parameters but you only bound Y
Too many parameters: the query defines X parameters and you bound Y

A:

the cleanest solution to this problem I've found so far, is to wrap all the parameters inside an array and then calling only once the setParameters() method, checking if there is at least one parameter to set:
$qb = $this->getEntityManager()->createQueryBuilder();
$qb = $qb
    ->select('SOMETHING')
    ->from('SOMEWHERE')
    ->where('SOME CONDITIONS')

$parameters = [];

if ( SOME CHECK ) {
    $qb
        ->andWhere('field1 = :field1')
        ->andWhere('field2 = :field2');

    $parameters['field1'] = $myFieldValue1;
    $parameters['field2'] = $myFieldValue2;

} else {
    $qb->andWhere('field1 = :field1');
    $parameters['field1'] = $myOtherFieldValue1;
}

if (count($parameters)) {
    $qb->setParameters($parameters);
}

