如何在Laravel框架中生成短链接并关联Article、Post、Music三个模型

Hey there! Let's tackle how to connect your existing short URL system with your Article, Post, and Music models. This approach uses polymorphic relationships—the cleanest way to link a single model to multiple other models without duplicating code. Here's a step-by-step breakdown:

First, modify your ShortLink model to support polymorphic relationships. This lets it associate with any of your three models seamlessly.

// app/Models/ShortLink.php
namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\MorphTo;

class ShortLink extends Model
{
    protected $fillable = ['code', 'url', 'shortable_type', 'shortable_id'];

    // Define the polymorphic relationship
    public function shortable(): MorphTo
    {
        return $this->morphTo();
    }
}

If your existing short_links table doesn't have the required polymorphic columns, create a migration to add them:

Run this command in your terminal:

php artisan make:migration add_shortable_fields_to_short_links_table

Then update the migration file:

// database/migrations/xxxx_xx_xx_add_shortable_fields_to_short_links_table.php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    public function up()
    {
        Schema::table('short_links', function (Blueprint $table) {
            // Adds `shortable_type` (stores the model class name) and `shortable_id` (stores the model ID)
            $table->morphs('shortable');
        });
    }

    public function down()
    {
        Schema::table('short_links', function (Blueprint $table) {
            $table->dropMorphs('shortable');
        });
    }
};

Run the migration to apply the changes:

php artisan migrate

Each of your content models needs a method to access its associated short link. Add this to each model:

For Article: #

// app/Models/Article.php
use App\Models\ShortLink;
use Illuminate\Database\Eloquent\Relations\MorphOne;

public function shortLink(): MorphOne
{
    // Use MorphMany instead if you want one model to have multiple short links
    return $this->morphOne(ShortLink::class, 'shortable');
}

For Post: #

// app/Models/Post.php
use App\Models\ShortLink;
use Illuminate\Database\Eloquent\Relations\MorphOne;

public function shortLink(): MorphOne
{
    return $this->morphOne(ShortLink::class, 'shortable');
}

For Music: #

// app/Models/Music.php
use App\Models\ShortLink;
use Illuminate\Database\Eloquent\Relations\MorphOne;

public function shortLink(): MorphOne
{
    return $this->morphOne(ShortLink::class, 'shortable');
}

When creating or updating a model (e.g., an Article), you can now attach a short link using the relationship. Here's an example in an Article controller:

// app/Http/Controllers/ArticleController.php
use App\Models\Article;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

public function store(Request $request)
{
    // Create the article first
    $article = Article::create($request->validated());

    // Generate your short code (use your existing logic here—this is just an example)
    $shortCode = Str::random(6);

    // Attach the short link to the article (automatically sets shortable_type and shortable_id)
    $article->shortLink()->create([
        'code' => $shortCode,
        'url' => route('articles.show', $article) // The full URL you want to shorten
    ]);

    return redirect()->route('articles.show', $article);
}

To get the short link for any model instance, just call the shortLink relationship:

// Get an article and its short link
$article = Article::find(1);
$shortUrl = route('shortlinks.redirect', $article->shortLink->code); // Replace with your redirect route

// Same for Post or Music
$post = Post::find(5);
$postShortUrl = route('shortlinks.redirect', $post->shortLink->code);

If you want to access the original model from the short link (for analytics or custom behavior), you can use the polymorphic relationship:

// In your ShortLinkController's redirect method
$shortLink = ShortLink::where('code', $request->code)->firstOrFail();
$originalModel = $shortLink->shortable; // This will be an Article, Post, or Music instance

// Example: Log a view for the original model
$originalModel->increment('view_count');

// Redirect to the full URL
return redirect($shortLink->url);

内容的提问来源于stack exchange，提问作者johnDoe220