suivicpt/app/Models/Transaction.php

<?php

declare(strict_types=1);

namespace App\Models;

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

class Transaction extends Model
{
    protected $fillable = ['household_id', 'category_id', 'user_id', 'date', 'date_effective', 'amount', 'details'];

    protected function casts(): array
    {
        return [
            'date' => 'date',
            'date_effective' => 'date',
            'amount' => 'decimal:2',
        ];
    }

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

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

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