I have two fields, value and copy that I’m trying to do some custom validation on to make sure they roughly match each other.

So far in my module I have this:

function HOOK_entity_bundle_field_info_alter(&$fields, EntityTypeInterface $entity_type, $bundle) {     if(!empty($fields['field_value']) && !empty($fields['field_copy']))     {         $fields['field_copy']->addConstraint('CopyMatchesValue');         $fields['field_value']->addConstraint('CopyMatchesValue');     } } 

A constraint

<?php  namespace DrupalMODULEPluginValidationConstraint;  use SymfonyComponentValidatorConstraint;  /**  * Checks that value matches copy  *  * @Constraint(  *   id = "CopyMatchesValue",  *   label = @Translation("Copy Matches Value", context = "Validation"),  * )  */ class CopyMatchesValue extends Constraint {     // The message that will be shown if the format is incorrect.     public $copyValueMismatch = 'The value does not look like it matches the copy.'; } 

And a validator

<?php  namespace DrupalMODULEPluginValidationConstraint;  use SymfonyComponentValidatorConstraint; use SymfonyComponentValidatorConstraintValidator;  /**  * Validates the CopyMatchesValue constraint.  */ class CopyMatchesValueValidator extends ConstraintValidator {   /**    * {@inheritdoc}    */   public function validate($items, Constraint $constraint)   {        foreach ($items as $key => $item) {           var_dump($item->value);       }       exit;        // do some processing to make sure they match        $this->context->addViolation();     }   } } 

I was expecting $items to have both fields I added the constraint to, but that doesn’t seem to be the case.

How can I pass two fields to one validator so that I can validate them against each other?

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