einundzwanzig-app/app/Models/Podcast.php

<?php

namespace App\Models;

use App\Models\Concerns\SetsCreatedBy;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Podcast extends Model
{
    use HasFactory;
    use SetsCreatedBy;

    /**
     * The attributes that aren't mass assignable.
     *
     * @var array
     */
    protected $guarded = [];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'id' => 'integer',
        'data' => 'array',
    ];

    public function createdBy(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    public function episodes(): HasMany
    {
        return $this->hasMany(Episode::class);
    }
}