Implementing and Querying Polymorphic Relationships in Laravel Eloquent

// Example Models:
// app/Models/Image.php
namespace App\Models;

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

class Image extends Model
{
    protected $fillable = ['url', 'imageable_id', 'imageable_type'];

    public function imageable(): MorphTo
    {
        return $this->morphTo();
    }
}

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

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

class Post extends Model
{
    protected $fillable = ['title', 'content'];

    public function images(): MorphMany
    {
        return $this->morphMany(Image::class, 'imageable');
    }
}

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

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

class User extends Model
{
    protected $fillable = ['name', 'email'];

    public function profileImages(): MorphMany
    {
        return $this->morphMany(Image::class, 'imageable');
    }
}

// Usage example:
use App\Models\User;
use App\Models\Post;
use App\Models\Image;

// Create a user and attach an image
$user = User::create(['name' => 'Jane Doe', 'email' => '[email protected]']);
$user->profileImages()->create(['url' => 'https://example.com/jane_avatar.jpg']);

// Create a post and attach multiple images
$post = Post::create(['title' => 'My First Post', 'content' => 'Lorem ipsum...']);
$post->images()->createMany([
    ['url' => 'https://example.com/post1_img1.jpg'],
    ['url' => 'https://example.com/post1_img2.jpg']
]);

// Retrieve images for a specific user
$userImages = User::find($user->id)->profileImages;
foreach ($userImages as $image) {
    echo "User Image URL: " . $image->url . "
"; // Output: https://example.com/jane_avatar.jpg
}

// Retrieve images for a specific post
$postImages = Post::find($post->id)->images;
foreach ($postImages as $image) {
    echo "Post Image URL: " . $image->url . "
"; // Output: ...post1_img1.jpg, ...post1_img2.jpg
}

// Accessing the parent model from an image
$someImage = Image::first();
if ($someImage) {
    echo "Image belongs to: " . ($someImage->imageable->name ?? $someImage->imageable->title) . "
";
    echo "Imageable Type: " . $someImage->imageable_type . "
"; // Output: App\Models\User or App\Models\Post
}