Select category by id on the admin product page

Question

Is it possible to define the category by id on the admin product page?

The idea is to capture the category by id (previously registered) and not by name. I found these codes to change that are responsible for that function:

admin/model/catalog/product.php

public function getProductCategories($product_id) {
  $product_category_data = array();

  $query = $this->db->query("SELECT * FROM " . DB_PREFIX . "product_to_category WHERE product_id = '" . (int)$product_id . "'");

  foreach ($query->rows as $result) {
     $product_category_data[] = $result['category_id'];
  }

  return $product_category_data;

}

admin/controller/catalog/product.php

// Categories
  $this->load->model('catalog/category');

  if (isset($this->request->post['product_category'])) {
     $categories = $this->request->post['category_id'];
  } elseif (isset($this->request->get['product_id'])) {      
     $categories = $this->model_catalog_product->getProductCategories($this->request->get['product_id']);
  } else {
     $categories = array();
  }

  $this->data['product_categories'] = array();

  foreach ($categories as $category_id) {
     $category_info = $this->model_catalog_category->getCategory($category_id);

     if ($category_info) {
        $this->data['product_categories'][] = array(
           'category_id' => $category_info['category_id'],
           'name'        => ($category_info['path'] ? $category_info['path'] . ' > ' : '') . $category_info['name']
        );
     }
  }

admin/view/template/catalog/product_form.tpl

<tr>
          <td><?php echo $entry_category; ?></td>
          <td><input type="text" name="category" value="" /></td>
        </tr>
        <tr>
          <td>&nbsp;</td>
          <td><div id="product-category" class="scrollbox">
              <?php $class = 'odd'; ?>
              <?php foreach ($product_categories as $product_category) { ?>
              <?php $class = ($class == 'even' ? 'odd' : 'even'); ?>
              <div id="product-category<?php echo $product_category['category_id']; ?>" class="<?php echo $class; ?>"><?php echo $product_category['name']; ?><img src="view/image/delete.png" alt="" />
                <input type="hidden" name="product_category[]" value="<?php echo $product_category['category_id']; ?>" />
              </div>
              <?php } ?>
            </div></td>
        </tr>

The problem is that I am not good in php and I don't know where I change to get that results. Thank you for some help or idea!

Answer 1

if (!empty($data['filter_name'])) { $sql .= " AND cp.category_id LIKE '" . $this->db->escape($data['filter_name']) . "%'";

line 211 in admin/model/catalog/category.php

I found the solution for my question, however it doesn't solved my problem. Thank everyone for help me!