hawese-wallet/src/Currency.php

<?php
// Copyright 2019-2022 Hackware SpA <human@hackware.cl>
// This file is part of "Hackware Web Services Wallet" and licensed under
// the terms of the GNU Affero General Public License version 3, or (at your
// option) a later version. You should have received a copy of this license
// along with the software. If not, see <https://www.gnu.org/licenses/>.

namespace Hawese\Wallet;

use Hawese\Core\Exceptions\ModelObjectNotFoundException;
use Illuminate\Database\Query\Builder;

class Currency extends TableModel
{
    public static $table = 'currencies';
    public static $attributes = [
        'id' => ['nullable', 'integer', 'min:1'],
        'code' => ['required', 'size:3'],
        'rate' => ['required', 'regex:/^\d{1,6}(?:\.\d{1,6})?$/'],
        'step' => ['required', 'regex:/^\d{1,4}(?:\.\d{1,4})?$/'],
        'created_at' => ['nullable', 'date'],
    ];

    /**
     * Select only the latest element per currency `code`
     */
    public static function select(
        ?array $attributes = null,
        bool $withDeleted = false
    ): Builder {
        $ids = app('db')
            ->table(self::$table)
            ->select(app('db')->raw('MAX(id) as id'))
            ->groupBy('code')
            ->pluck('id');

        return parent::select($attributes)
            ->whereIn('id', $ids);
    }

    /**
     * Return only the latest object with this `code`
     */
    public static function findByCode($code) : self
    {
        $query =  'SELECT * FROM ' . self::$table . ' ' .
            'WHERE code = ? ORDER BY id DESC LIMIT 1';

        $row = app('db')->selectOne($query, [$code]);

        if ($row) {
            return new self($row);
        }

        throw new ModelObjectNotFoundException(static::class, ['code'], $code);
    }

    public function update($fields = []) : bool
    {
        return false;
    }

    public function delete() : bool
    {
        return false;
    }
}