persegi/app/Models/CashRecord.php

<?php

namespace App\Models;

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

class CashRecord extends Model
{
    protected $fillable = [
        'amount', 'category_id', 'activity_id', 'description',
        'date', 'created_by', 'verified_by', 'verified_at',
    ];

    protected $casts = [
        'date'        => 'date',
        'verified_at' => 'datetime',
    ];

    protected static function booted(): void
    {
        static::creating(function (CashRecord $record) {
            $record->created_by ??= auth()->id();
        });
    }

    public function category(): BelongsTo
    {
        return $this->belongsTo(CashCategory::class, 'category_id');
    }

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

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

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

    public function approval(): \Illuminate\Database\Eloquent\Relations\MorphOne
    {
        return $this->morphOne(\App\Models\Approval::class, 'approvable', 'model_type', 'model_id');
    }
}