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<?php

namespace App;

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

class Article extends Model
{
    // 略
    public function likes(): BelongsToMany
    {
        return $this->belongsToMany('App\User', 'likes')->withTimestamps();
    }
    
    public function isLikedBy(?User $user): bool
    {
        return $user
            ? (bool)$this->likes->where('id', $user->id)->count()
            : false;
    }

    //===========ここから追加===========
    public function getCountLikesAttribute(): int
    {
        return $this->likes->count();
    }
    //===========ここまで追加===========
}