public function getMedicalCertificate() { return $this->hasMany(MedicalCertificate::className(), ['au_id' => 'au_id']); }
public function getMedicalCertificate() { return $this->hasOne(MedicalCertificate::className(), ['mc_id' => 'mc_id']); }
public function getMedicalCertificate() { //a student has many medical certificate return $this->hasMany(MedicalCertificate::className(), ['student_id' => 'student_id']); }