wiki_travel_site/app/Models/City.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Support\Str;

class City extends Model
{
    use HasFactory;

    protected $fillable = [
        'name',
        'slug',
        'country',
        'latitude',
        'longitude',
        'wikipedia_summary',
        'wikipedia_url',
        'thumbnail_url',
        'image_url',
        'wikipedia_page_id',
        'wikipedia_cached_at',
    ];

    protected $casts = [
        'latitude' => 'decimal:7',
        'longitude' => 'decimal:7',
        'wikipedia_cached_at' => 'datetime',
    ];

    /**
     * Get the route key for the model.
     */
    public function getRouteKeyName(): string
    {
        return 'slug';
    }

    /**
     * Boot the model and set up event listeners
     */
    protected static function boot()
    {
        parent::boot();

        static::creating(function ($city) {
            if (empty($city->slug)) {
                $city->slug = static::generateUniqueSlug($city->name);
            }
        });

        static::updating(function ($city) {
            if ($city->isDirty('name') && empty($city->slug)) {
                $city->slug = static::generateUniqueSlug($city->name);
            }
        });
    }

    /**
     * Generate a unique slug from city name
     */
    protected static function generateUniqueSlug(string $name): string
    {
        $slug = Str::slug($name);
        $originalSlug = $slug;
        $count = 1;

        while (static::where('slug', $slug)->exists()) {
            $slug = $originalSlug . '-' . $count;
            $count++;
        }

        return $slug;
    }

    /**
     * Get all attractions for this city
     */
    public function attractions(): HasMany
    {
        return $this->hasMany(Attraction::class);
    }

    /**
     * Get all trips that include this city
     */
    public function trips(): BelongsToMany
    {
        return $this->belongsToMany(Trip::class, 'city_trip')
            ->withPivot('order')
            ->withTimestamps()
            ->orderByPivot('order');
    }

    /**
     * Get users who favorited this city
     */
    public function favoritedBy(): BelongsToMany
    {
        return $this->belongsToMany(User::class, 'favorites')
            ->withTimestamps();
    }
}