trip-planner/backend/app/Models/Trip.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Trip extends Model
{
    use HasFactory;
    protected $fillable = [
        'name',
        'description',
        'start_date',
        'end_date',
        'created_by_user_id'
    ];

    protected $casts = [
        'start_date' => 'date',
        'end_date' => 'date',
    ];

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by_user_id');
    }

    public function plannableItems(): HasMany
    {
        return $this->hasMany(PlannableItem::class);
    }

    public function calendarSlots(): HasMany
    {
        return $this->hasMany(CalendarSlot::class)->orderBy('slot_date')->orderBy('slot_order');
    }
}