opensourcepos/app/Models/Item_taxes.php

<?php

namespace App\Models;

use CodeIgniter\Model;

/**
 * Item_taxes class
 */
class Item_taxes extends Model
{
    protected $table = 'item_taxes';
    protected $primaryKey = 'item_id';
    protected $useAutoIncrement = false;
    protected $useSoftDeletes = false;
    protected $allowedFields = [
        'name',
        'percent'
    ];

    /**
     * Gets tax info for a particular item
     */
    public function get_info(int $item_id): array
    {
        $builder = $this->db->table('items_taxes');
        $builder->where('item_id', $item_id);

        //return an array of taxes for an item
        return $builder->get()->getResultArray();
    }

    /**
     * Inserts or updates an item's taxes
     */
    public function save_value(array &$items_taxes_data, int $item_id): bool
    {
        $success = true;

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->transStart();

        $this->delete($item_id);

        $builder = $this->db->table('items_taxes');

        foreach($items_taxes_data as $row)
        {
            $row['item_id'] = $item_id;
            $success &= $builder->insert($row);
        }

        $this->db->transComplete();

        $success &= $this->db->transStatus();

        return $success;
    }

    /**
     * Saves taxes for multiple items
     */
    public function save_multiple(array &$items_taxes_data, string $item_ids): bool    //TODO: investigate why this is sent as a : delimited string rather than an array.
    {
        $success = true;

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->transStart();

        foreach(explode(':', $item_ids) as $item_id)
        {
            $this->delete($item_id);

            $builder = $this->db->table('items_taxes');

            foreach($items_taxes_data as $row)
            {
                $row['item_id'] = $item_id;
                $success &= $builder->insert($row);
            }
        }

        $this->db->transComplete();

        $success &= $this->db->transStatus();

        return $success;
    }

    /**
     * Deletes taxes given an item
     */
    public function delete($item_id = null, bool $purge = false): bool
    {
        $builder = $this->db->table('items_taxes');

        return $builder->delete(['item_id' => $item_id]);
    }
}