check if record exist in Laravel 5.5 [closed] - php

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I have a dynamic input form, I want to check if the record exists, if no then it can not insert data
my controller
$user = Master::where('id_a','=',$request->get('id_a'))->where('id_b','=',$request->get('id_b'))->get();
if($user->isEmpty()){
// insert
}else{
//message "cannot input"
}
if insert one data, success.. but if insert array in my controller not check..
why in input array data always insert???

Answer 1

This is pseudo for only check id_b
$data = [1,2,3,4];
$data_a = [1,2,3,4];
$masters = Master::whereIn('id_b', $data)->whereIn('id_a', $data_a)->get();
foreach($data as $key => $value) {
$isExisted = false;
foreach ($masters as $master) {
if ($master->id_b == $value[$key] && $master->id_a == $data_a[$key])
{
$isExisted = true;
break;
}
}
if ( ! $isExisted) {
$master = new Banner();
$master->value = your_data;
$master->save();
}
}

Answer 2

You could use exists()
if(Master::where('id_a','=',$request->get('id_a'))->where('id_b','=',$request->get('id_b'))->exists()) {
do something
}
Also I would suggest you reduce the amount of in-line stuff you're doing, instead something like this:
$id_a = $request->get('id_a');
$id_b = $request->get('id_b');
if(Master::where('id_a','=', $id_a)->where('id_b','=',$id_b)->exists()) {
do something
}

Answer 3

If I understand correctly, you want to insert a Master if a given id_a and id_b doesn't already exists for one Master
If so, you could actually use firstOrCreate :
Master::firstOrCreate(
['id_a' => $request->get('id_a'), 'id_b' => $request->get('id_b')],
['yourcolumntocreate' => columnvalue, ...]
)