Laravel - 在记录更新时设置列的默认值

Question

I have this migration:

class CreatePendingCredits extends Migration
{
    public function up()
    {
        Schema::create('pending_credits', function (Blueprint $table) {
            $table->id();
            $table->uuid('uuid')->unique()->default(DB::raw('UUID()'));
            $table->foreignIdFor(App\Models\User::class, 'user_id')->references('id')->on('users');
            $table->double('amount');
            $table->timestamps();
        });
    }

    public function down()
    {
        Schema::dropIfExists('pending_credits');
    }
}

When I'm creating a new record for pending_credits , I don't set uuid attribute, so database will generate a new uuid (uses the default value).

Let's say for some reason I need to update the uuid of one record just like when I'm creating a new record and database generates the uuid.

Is it:

PendingCredit::find(18)->update(['uuid'=>null]);

Or:

PendingCredit::find(18)->update(['uuid'=>DB::raw('UUID()')]);

Or is there a standard way to this?

Answer 1

$table->double('amount')->default(1);