contabilidad/api/src/Cuenta.php

<?php
namespace Contabilidad;

use ProVM\Common\Alias\Model;

/**
 * @property int $id
 * @property string $nombre
 * @property Categoria $categoria_id
 */
class Cuenta extends Model {
  public static $_table = 'cuentas';
  protected static $fields = ['nombre', 'categoria_id'];

  protected $categoria;
  public function categoria() {
    if ($this->categoria === null) {
      $this->categoria = $this->childOf(Categoria::class, [Model::SELF_KEY => 'categoria_id']);
    }
    return $this->categoria;
  }

  protected $entradas;
  public function entradas() {
    if ($this->entradas === null) {
      $this->entradas = $this->parentOf(Entrada::class, [Model::CHILD_KEY => 'cuenta_id']);
    }
    return $this->entradas;
  }

  protected $cargos;
  public function cargos() {
    if ($this->cargos === null) {
      $this->cargos = $this->parentOf(Transaccion::class, [Model::CHILD_KEY => 'hasta_id']);
    }
    return $this->cargos;
  }
  protected $abonos;
  public function abonos() {
    if ($this->abonos === null) {
      $this->abonos = $this->parentOf(Transaccion::class, [Model::CHILD_KEY => 'desde_id']);
    }
    return $this->abonos;
  }
  protected $transacciones;
  public function transacciones($limit = null, $start = 0) {
    if ($this->transacciones === null) {
      $transacciones = Model::factory(Transaccion::class)
        ->join('cuentas', 'cuentas.id = transacciones.desde_id OR cuentas.id = transacciones.hasta_id')
        ->whereEqual('cuentas.id', $this->id)
        ->orderByAsc('transacciones.fecha');
      if ($limit !== null) {
        $transacciones = $transacciones->limit($limit)
          ->offset($start);
      }
      $this->transacciones = $transacciones->findMany();
      foreach ($this->transacciones as &$transaccion) {
        $transaccion->setFactory($this->factory);
        if ($transaccion->desde_id === $this->id) {
          $transaccion->valor = - $transaccion->valor;
        }
      }
    }
    return $this->transacciones;
  }
  protected $saldo;
  public function saldo() {
    if ($this->saldo === null) {
      $this->saldo = 0;
      if (count($this->transacciones()) > 0) {
        $this->saldo = array_reduce($this->transacciones(), function($sum, $item) {
          return $sum + $item->valor;
        });
      }
    }
    return $this->saldo;
  }

  public function toArray(): array {
    $arr = parent::toArray();
    $arr['categoria'] = $this->categoria()->toArray();
    $arr['saldo'] = $this->saldo();
    $arr['saldoFormateado'] = '$' . number_format($this->saldo(), 0, ',', '.');
    return $arr;
  }
}