EntityConstraintViolationList::filterByFields

public EntityConstraintViolationList::filterByFields(array $field_names)

public function filterByFields(array $field_names) {
  $this->groupViolationOffsets();
  $new_violations = [];
  foreach (array_intersect_key($this->violationOffsetsByField, array_flip($field_names)) as $field_name => $offsets) {
    foreach ($offsets as $offset) {
      $violation = $this->get($offset);
      // Take care of composite field violations and re-map them to some
      // covered field if necessary.
      if ($violation->getConstraint() instanceof CompositeConstraintBase) {
        $covered_fields = $violation->getConstraint()->coversFields();

        // Keep the composite field if it covers some remaining field and put
        // a violation on some other covered field instead.
        if ($remaining_fields = array_diff($covered_fields, $field_names)) {
          $message_params = ['%field_name' => $field_name];
          $violation = new ConstraintViolation(
          $this->t('The validation failed because the value conflicts with the value in %field_name, which you cannot access.', $message_params), 
          'The validation failed because the value conflicts with the value in %field_name, which you cannot access.', 
          $message_params, 
          $violation->getRoot(), 
          reset($remaining_fields), 
          $violation->getInvalidValue(), 
          $violation->getPlural(), 
          $violation->getCode(), 
          $violation->getConstraint(), 
          $violation->getCause()
          );
          $new_violations[] = $violation;
        }
      }

      $this->remove($offset);
    }
  }
  foreach ($new_violations as $violation) {
    $this->add($violation);
  }
  return $this;
}