project-minnesota/app/Models/Image.php

<?php

namespace App\Models;

use App\HasThumbnail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Image extends Model implements HasThumbnail
{
    use HasFactory;

    /**
     * The model's default values for attributes.
     *
     * @var array
     */
    protected $attributes = [
        'isCover' => false,
    ];

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = ['album_id'];

    public function album(): BelongsTo
    {
        return $this->belongsTo(Album::class);
    }

    public function getThumbnail() : string {
        return route('image.show', $this);
    }
}