laravel如何实现一个基于标签(Tagging)的系统_Laravel标签系统实现方法

Schema::create('tags', function (Blueprint $table) {
    $table->id();
    $table->string('name');
    $table->string('slug')->unique();
    $table->timestamps();
});

Schema::create('taggables', function (Blueprint $table) {
    $table->unsignedBigInteger('tag_id');
    $table->unsignedBigInteger('taggable_id');
    $table->string('taggable_type'); // 模型类名，如 App\Models\Post
    $table->index(['tag_id', 'taggable_id', 'taggable_type']);
    $table->foreign('tag_id')->references('id')->on('tags')->onDelete('cascade');
});

class Tag extends Model
{
    protected $fillable = ['name', 'slug'];

    public function taggables()
    {
        return $this->morphedByMany(
            \App\Models\Post::class,
            'taggable',
            'taggables',
            'tag_id',
            'taggable_id'
        );
    }
}

class Post extends Model
{
    public function tags()
    {
        return $this->morphToMany(Tag::class, 'taggable');
    }
}

$tagNames = ['Laravel', 'PHP', 'Web开发'];

$tags = collect($tagNames)->map(function ($name) {
    return Tag::firstOrCreate([
        'name' => $name,
        'slug' => Str::slug($name)
    ]);
});

$post->tags()->sync($tags->pluck('id'));

$posts = Post::whereHas('tags', function ($query) {
    $query->where('slug', 'laravel');
})->get();

$tag = Tag::where('slug', 'laravel')->first();
$posts = $tag->taggables()->where('taggable_type', Post::class)->get();

Post::whereHas('tags', function ($q) { $q->where('slug', 'laravel'); })
    ->whereHas('tags', function ($q) { $q->where('slug', 'php'); })
    ->get();

$post->attachTags(['Laravel', 'Tutorial']);
Post::withAnyTags(['Laravel', 'PHP'])->get();