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EloquentでStringなプリマリーキーの実装。

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Ramsey\Uuid\Uuid;

class Post extends Model
{
    // primary key column, default id.
\!h    protected $primaryKey = 'uuid';

    // primary key type, default int.
\!h    protected $keyType = 'string';

    // primary key auto incrementing, default true.
\!h    public $incrementing = false;

    // constructor 
    public function __construct(array $attributes = [])
    {
        parent::__construct($attributes);

        // generate uuid
        $this->attributes['uuid'] = Uuid::uuid4()->toString();
    }
}