1

Is there a direct relation between code in templates and PHP code inside a controller for example? I need to translate

{% set relatedProducts = craft.entries.section('products').relatedTo({
                   targetElement: testVariant,
                   field: "productVariants.productSizes"
}) %} 

into a controller and im not sure how.

1

A very similar question has been asked before How can I follow relations in ElementCriteriaModels from plugin code. You would want something like this:

$criteria = craft()->elements->getCriteria(ElementType::Entry);
$criteria->section = 'products';
$criteria->relatedTo = array(
    'targetElement' => $e,
    'field'         => $field
);
$elements = craft()->elements->findElements($criteria);

Where $e is testVariant, and $field is productVariants.productSizes, which can be retrieved using craft()->elements->getElementById(id) and craft()->fields->getFieldById(id) or getFieldByHandle(handle) respectively.

To create a controller see the documentation on Controllers.

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