Laravel : Update if exists, If not delete | Relational data - php

Question

I am updating/deleting some form data in database :
The relation is : One to Many: UserService => UserServiceVaccine
I am trying to update the table data if the form have that data, Otherwise remove if form data have not the data :
Current code :
foreach ($request->dog_vaccine_required as $key => $vaccine) {
$serviceVaccination = \App\UserServiceVaccination::updateOrCreate([
'user_service_id' => $id,
'vaccine_id' => $vaccine
],[
'specie' => 'Dog',
'user_service_id' => $id,
'vaccine_id' => $vaccine,
'duration_6' => $request->dog_duration_6[$key],
'duration_12' => $request->dog_duration_12[$key],
'duration_36' => $request->dog_duration_36[$key]
]);
}
It gives me offset exception. if i remove a checkbox.
What should be done.

Answer 1

Do you can try this ?
foreach ($request->dog_vaccine_required as $key => $vaccine) {
$shouldUpdate=isset($request->dog_duration_6[$key])&&
isset($request->dog_duration_12[$key])&&
isset($request->dog_duration_36[$key]);
if ($shouldUpdate){
$serviceVaccination = \App\UserServiceVaccination::updateOrCreate([
'user_service_id' => $id,
'vaccine_id' => $vaccine
],[
'specie' => 'Dog',
'user_service_id' => $id,
'vaccine_id' => $vaccine,
'duration_6' => $request->dog_duration_6[$key],
'duration_12' => $request->dog_duration_12[$key],
'duration_36' => $request->dog_duration_36[$key]
]);
}else{
// Delete
}
}

Answer 2

I think that's a "many to many" relationship between user_service table and vaccine table.
Based on the docs here https://laravel.com/docs/5.6/eloquent-relationships#many-to-many
$serviceVaccinationArray = [];
foreach ($request->dog_vaccine_required as $key => $vaccine) {
$serviceVaccinationArray[$vaccine] = [
'vaccine_id' => $vaccine,
'specie' => 'Dog',
'duration_6' => $request->dog_duration_6[$key],
'duration_12' => $request->dog_duration_12[$key],
'duration_36' => $request->dog_duration_36[$key]
]
}
$userService = UserService::find($id);
$userService->vaccine()->sync($serviceVaccinationArray);
The sync method accepts an array of IDs to place on the intermediate table. Any IDs that are not in the given array will be removed from the intermediate table.