Laravel8 attribute or appends in query where

I want to reach the record

if in model User

class User extends Model {

       protected $fillable = ['last_name','first_name'];

       protected $appends = [
         'full_name',
       ];

       public function getFullNameAttribute(): string
       {
            return $this->first_name . ' ' . $this->last_name;
       }
}

in request

full_name = 'John Johans';

How to get database record if

 User::query()->where('full_name',$request->full_name) 

If I use this record the answer will be an error that full_name does not exist in the database

I would like to use "where" for "appends"

User::query()->where(**MY ATTRIBUTE**,$request)->first()

it is possible ?

2 Options:

1. Use CONCAT in your WHERE clause

User::query()
    ->whereRaw('CONCAT(first_name, " ", last_name) = "?"', [$request->full_name])
    ->get();

2. Get all the users and then filter in the resulting Collection.

User::cursor()
    ->filter(function ($user) use ($request) {
        return $user->full_name == $request->full_name;
    })
    ->collect();

User::cursor()
    ->filter(fn($user) => $user->full_name == $request->full_name)
    ->collect();

Letting SQL do the filtering (Option 1) is probably the better choice.