Pass parent id while inserting in 2 columns with one-to-one relation

October 26, 2022

I have 2 columns with one-to-one relation users and doctors:

    Users
_____________
| id | name |
|____|______|
| 1  | John |
|____|______|


        Doctors
_____________________
| id | dep | user_id |
|____|_____|_________|
| 1  |  2  |    1    |
|____|_____|_________|

User model has this function that returns the doctor with relation:

public function doctor(){
    return $this->hasOne(Doctor::class);
}

Inserting data:

$valdiated = $request->validated();

$userData = [
    'name' => $valdiated['name'],
];

$doctorData = [
    'dep' => $valdiated['dep'],
];

$newUser = new User();
$newUser->insert($userData);
$newUser->doctor()->insert($doctorData);

But I’m getting this error:

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`db`.`doctors`, CONSTRAINT `doctors_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE) (SQL: insert into `doctors` (`dep`) values (2))

Is there a way to insert the user_id into doctors table or I have to query the database and get the last id?

>Solution :

You should use create() instead of insert since it will return a instance of the new Model that you just created. Then you will use the doctor() to create a associated to the doctor table.

$newUser = User::create($userData);
$newDoctor = $newUser->doctor()->create($doctorData);

dd($newUser,$newDoctor); //Just to check if the data is inserted.