EntityForm::copyFormValuesToEntity

protected EntityForm::copyFormValuesToEntity(EntityInterface $entity, array $form, FormStateInterface $form_state)

protected function copyFormValuesToEntity(EntityInterface $entity, array $form, FormStateInterface $form_state) {
  $values = $form_state->getValues();

  if ($this->entity instanceof EntityWithPluginCollectionInterface) {
    // Do not manually update values represented by plugin collections.
    $values = array_diff_key($values, $this->entity->getPluginCollections());
  }

  // @todo: This relies on a method that only exists for config and content
  //   entities, in a different way. Consider moving this logic to a config
  //   entity specific implementation.
  foreach ($values as $key => $value) {
    $entity->set($key, $value);
  }
}