slake-school-service/app/Models/Banner.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

class Banner extends Model
{
    use SoftDeletes;

    public const TYPE_COURSE = 'course';

    public const TYPE_ACTIVITY = 'activity';

    public const TYPE_NEWS = 'news';

    public const TYPE_CUSTOM = 'custom';

    protected $fillable = [
        'type',
        'course_id',
        'activity_id',
        'news_id',
        'title',
        'cover_url',
        'content_html',
        'sort',
        'status',
    ];

    protected $casts = [
        'course_id' => 'integer',
        'activity_id' => 'integer',
        'news_id' => 'integer',
        'sort' => 'integer',
        'status' => 'integer',
    ];

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

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

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

    public static function typeLabel(string $type): string
    {
        return match ($type) {
            self::TYPE_COURSE => '课程',
            self::TYPE_ACTIVITY => '活动',
            self::TYPE_NEWS => '资讯',
            self::TYPE_CUSTOM => '自定义',
            default => $type,
        };
    }
}