nihonbuzz-academy/app/Models/Lesson.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Concerns\HasUuids;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Spatie\MediaLibrary\HasMedia;
use Spatie\MediaLibrary\InteractsWithMedia;

class Lesson extends Model implements HasMedia
{
    use HasFactory, HasUuids, SoftDeletes, InteractsWithMedia;

    protected $guarded = [];

    protected $casts = [
        'metadata' => 'array',
        'is_free_preview' => 'boolean',
    ];

    public function module(): BelongsTo
    {
        return $this->belongsTo(Module::class);
    }

    public function vocabularies()
    {
        return $this->belongsToMany(Vocabulary::class, 'lesson_vocabulary');
    }
}