Get model from ID in Yii - php

Question

I want to change what is shown in my yii2 app's history view, so that I don't show a person's ID but his first and last name.
This is a part of my data grid
[
'attribute' => 'oldPerson.Id',
'label' => Yii::t('app', 'Previously In Charge'),
'value' => function($model){
return $model->person->FirstName . ' ' . $model->person->LastName; }
],
but this isn't good since my $model is a history object, which contains a person's ID. I somehow need to obtain the entire person object based on that ID, but I don't know how.
This is my Person model:
namespace app\models;
use Yii;
use \app\models\base\Person as BasePerson;
/**
* This is the model class for table "person".
*/
class Person extends BasePerson
{
public $created_at;
public $created_by;
public $updated_at;
public $updated_by;
public $id;
/**
* #inheritdoc
*/
public function rules()
{
return array_replace_recursive(parent::rules(),
[
[['FirstName', 'LastName', 'Title', 'CitizenNumber', 'Employment', 'Contact'], 'required'],
[['FirstName'], 'string', 'max' => 20],
[['LastName'], 'string', 'max' => 40],
[['Title'], 'string', 'max' => 50],
[['CitizenNumber'], 'string', 'max' => 13],
[['Employment', 'Contact'], 'string', 'max' => 100],
[['CitizenNumber'], 'unique']
]);
}
}

Answer 1

Normally you can get the model based on id this way
public function findModel($id)
{
if (($model = Person ::findOne($id)) !== null) {
return $model;
} else {
throw new NotFoundHttpException('The requested page does not exist.');
}
}
$model contain the Person info related to $id

Answer 2

its also working fine
$model=Modelname::findOne($id);