szkp-map-service/app/Models/Activity.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class Activity extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'venue_id',
        'title',
        'summary',
        'category',
        'quota',
        'registered_count',
        'start_at',
        'end_at',
        'address',
        'lat',
        'lng',
        'detail_html',
        'cover_image',
        'gallery_media',
        'tags',
        'reservation_notice',
        'open_time',
        'sort',
        'is_active',
        'booking_audience',
        'total_quota',
        'min_people_per_order',
        'max_people_per_order',
    ];

    protected $casts = [
        'start_at' => 'datetime',
        'end_at' => 'datetime',
        'lat' => 'float',
        'lng' => 'float',
        'gallery_media' => 'array',
        'tags' => 'array',
        'sort' => 'integer',
        'is_active' => 'boolean',
        'total_quota' => 'integer',
        'min_people_per_order' => 'integer',
        'max_people_per_order' => 'integer',
    ];

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

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

    public function activityDays(): HasMany
    {
        return $this->hasMany(ActivityDay::class)->orderBy('activity_date');
    }

    /**
     * 按未取消预约的票数合计，回写 activities.registered_count（展示用「已预约总人数」）。
     */
    public static function refreshRegisteredCountFromReservations(int $activityId): void
    {
        $total = (int) Reservation::query()
            ->where('activity_id', $activityId)
            ->where('status', '!=', 'cancelled')
            ->get()
            ->sum(fn (Reservation $r) => max(1, (int) ($r->ticket_count ?? 1)));

        static::query()->where('id', $activityId)->update(['registered_count' => $total]);
    }
}