Laravel 6.x relationship default value on first relation - php

Question

I want to set a default value for the first relation element and after that another. For example:
Customer can have multiple addresses.
The addresses table has the column main_address.
When I create a customer and the first address for him, Laravel should then give the column main_address the value 1. The second should get the value 0 (if not specified different).
Is Laravel capable of doing this?
My creating prozess of a customer is the following:
$customer = \App\Customer::create(["data"]);
$customer->customerAddress()->create(["data"]);
$customer->contactPerson()->create(["data"]);
Can this prozess be improved?
The relations are both Many to one. A customer can have multiple contact persons and addresses.

Answer 1

You can do this
$customer = \App\Customer::create(["data"]);
$address = $customer->customerAddress()->create(["data"]);
$main_address_exists = $customer->customerAddress()->where('main_address', 1)->first();
if (!$main_address_exists) {
$address->main_address = 1;
$address->save();
}
So you first check whether this customer has an address with field main_address, 1 and if it doesn't have any such record it will make the last address as 1
OR
$customer = \App\Customer::create(["data"]);
$data_for_addresses = [
'main_address' => 0
];
$main_address_exists = $customer->customerAddress()->where('main_address', 1)->first();
if (!$main_address_exists) {
$data_for_addresses['main_address'] = 1;
}
$customer->customerAddress()->create($data_for_addresses);