blog_tp6/app/model/TagArticle.php

<?php

declare(strict_types=1);

namespace app\model;

use think\facade\Db;

use app\model\Base;
use app\model\Tag;

class TagArticle extends Base
{
    protected $pk = 'id';

    protected $schema = [
        'id'   => "int",  // 主键id
        "tid"  => "int",  // 标签id
        "aid" => "int",   // 文章id
        "cid"    => "int", // 栏目id
    ];

    protected $autoWriteTimestamp = false;

    public function article()
    {
        return $this->belongsTo('Article', 'aid')->bind(['title', 'titlepic', 'summary', 'hits', 'create_time', 'username']);
    }

    public function category()
    {
        return $this->belongsTo('Category', 'cid')->bind(['category_url' => 'url', 'category_name' => 'name']);
    }

    public static function queryList($tagid)
    {
        return self::with(['article', 'category'])->where('tid', $tagid)->order('aid DESC')->paginate();
    }

    public static function saveArticleTag(array $tags, int $aid, int $cid)
    {
        foreach ($tags as  $tagname) {
            $tag = Tag::where('tagname', $tagname)->findOrEmpty();
            if ($tag->isEmpty()) {
                $tag->tagname = $tagname;
            }
            $tag->nums += 1;
            $tag->save();

            self::create([
                'tid' => $tag->id,
                'aid' => $aid,
                'cid' => $cid
            ]);
        }
    }

    public static function delArticleTag(array $tags, int $aid)
    {
        foreach ($tags as  $tagname) {
            $tag = Tag::where('tagname', $tagname)->findOrEmpty();

            if ($tag != null) {
                $tag->nums = $tag->nums - 1;
                
                $tag->nums = $tag->nums > 0 ? $tag->nums : 0;

                $tag->save();

                self::where(['aid'=>$aid, 'tid'=>$tag->id])->delete();
            }
        }
    }
}