laravelio/laravel.io

use Illuminate\Database\Eloquent\Relations\MorphToMany;

final class Tag extends Model
{
    public function articles(): MorphToMany
    {
        return $this->morphedByMany(Article::class, 'taggable');
    }
}

use App\Models\Tag;
use Illuminate\Database\Eloquent\Relations\MorphToMany;

trait HasTags
{
    public function tags()
    {
        return $this->tagsRelation;
    }

    public function syncTags(array $tags)
    {
        $this->save();
        $this->tagsRelation()->sync($tags);

        $this->unsetRelation('tagsRelation');
    }

    public function removeTags()
    {
        $this->tagsRelation()->detach();

        $this->unsetRelation('tagsRelation');
    }

    public function tagsRelation(): MorphToMany
    {
        return $this->morphToMany(Tag::class, 'taggable')->withTimestamps();
    }
}

use App\Helpers\HasLikes;
use App\Helpers\HasTags;

final class Thread extends Model
{
    use HasLikes;
    use HasTags;

    public static function feedByTagPaginated(Tag $tag, int $perPage = 20): Paginator
    {
        return static::feedByTagQuery($tag)
            ->paginate($perPage);
    }

    public static function feedByTagQuery(Tag $tag): Builder
    {
        return static::feedQuery()
            ->join('taggables', function ($join) {
                $join->on('threads.id', 'taggables.taggable_id')
                    ->where('taggable_type', static::TABLE);
            })
            ->where('taggables.tag_id', $tag->id());
    }
}

use App\Models\Like;
use Illuminate\Database\Eloquent\Relations\MorphMany;

trait HasLikes
{
    public function likesRelation(): MorphMany
    {
        return $this->morphMany(Like::class, 'likesRelation', 'likeable_type', 'likeable_id');
    }
}

use App\Helpers\HasLikes;
use App\Helpers\HasTags;

final class Article extends Model
{
    use HasLikes;
    use HasTags;

    protected $with = [
        'likesRelation',
    ];
}

use App\Models\Article;

final class CreateArticle
{
    private $tags;

    public function handle(): Article
    {
        $article = new Article([
            'title' => $this->title,
            'body' => $this->body,
            'original_url' => $this->originalUrl,
            'slug' => $this->title,
            'submitted_at' => $this->shouldBeSubmitted ? now() : null,
        ]);
        $article->syncTags($this->tags);

        return $article;
    }
}

use App\Models\Article;

final class LikeArticle
{
    public function handle(): void
    {
        if ($this->article->isLikedBy($this->user)) {
            throw CannotLikeItem::alreadyLiked('article');
        }

        $this->article->likedBy($this->user);
    }
}