Laravel5 eager loading not working

I have the following models

class ParentModel extends Model
{
  public function children()
  {
    return $this->hasMany('App\Model\Student', 'parent_id');
  }
}

class Student extends Model
{

}

When I use ParentModel::find(1)->children, it gives the correct result. But when I use ParentModel::with('children')->find(1), the result array contains a children key with value as empty array.

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