/**
  * @return \yii\db\ActiveQuery
  */
 public function getStudent()
 {
     return $this->hasOne(StudentForm::className(), ['id' => 'student_id']);
 }
 public function getApplicantLastName($id)
 {
     $student = $this->hasOne(StudentForm::className(), ['id' => 'applicant_id']);
     return $student['last_name'];
 }