在类别页面上获取自定义字段

最近我买了一个扩展，为我的产品创建自定义字段。这个扩展在我的产品页面上运行得很好，显示了我在管理员上输入的所有信息。但我也需要在分类页面中显示这些自定义字段，这样我就可以列出一些信息。

我尝试复制代码并将其归入类别（Controller和View），但它返回空-没有显示任何内容：没有错误，没有警告。。没有任何信息。

扩展名附带一个vqmod文件，主要在目录文件夹中进行操作：

目录中的更改：产品/控制器：

$this->data['text_download'] = $this->language->get('text_download');
        if ($this->config->get('cpf_fields')) {
           $fields = $this->config->get('cpf_fields');
        } else {
           $fields = array();
        }
        $field_data = array();
        if (!empty($product_info['cpf'])) {
           $cpf = unserialize($product_info['cpf']);
        } else {
           $cpf = array();
        }
        $this->load->model('catalog/option');
        foreach ($fields as $field) {
           $option = $this->model_catalog_option->getOption($field['option_id']);
           if ($option) {
              if ($option['type'] == 'select' || $option['type'] == 'radio') {
                 $values = array();
                 $option_values = $this->model_catalog_option->getOptionValues($field['option_id']);
                 foreach ($option_values as $option_value) {
                    $selected = (!empty($cpf[$field['option_id']])) ? $cpf[$field['option_id']] : 0;
                    $values[] = array(
                       'option_value_id'      => $option_value['option_value_id'],
                       'name'               => $option_value['name'],
                       'selected'            => $selected
                    );
                 }
                 $field_data[] = array(
                    'name'          => $option['name'],
                    'type'          => $option['type'],
                    'status'      => $field['status'],
                    'sort_order'   => $field['sort_order'],
                    'values'      => $values
                 );
              } elseif ($option['type'] == 'checkbox') {
                 $values = array();
                 $option_values = $this->model_catalog_option->getOptionValues($field['option_id']);
                 foreach ($option_values as $option_value) {
                    $selected = (!empty($cpf[$field['option_id']]) && is_array($cpf[$field['option_id']]) && in_array($option_value['option_value_id'], $cpf[$field['option_id']])) ? $option_value['option_value_id'] : 0;
                    $values[] = array(
                       'option_value_id'      => $option_value['option_value_id'],
                       'name'               => $option_value['name'],
                       'selected'            => $selected
                    );
                 }
                 $field_data[] = array(
                    'name'          => $option['name'],
                    'type'          => $option['type'],
                    'status'      => $field['status'],
                    'sort_order'   => $field['sort_order'],
                    'values'      => $values
                 );
              } else {
                 $value = (!empty($cpf[$field['option_id']])) ? $cpf[$field['option_id']] : '';;
                 $field_data[] = array(
                    'name'          => $option['name'],
                    'type'          => $option['type'],
                    'status'      => $field['status'],
                    'sort_order'   => $field['sort_order'],
                    'value'         => $value
                 );
              }
           }
        }
        $sort_order = array(); 
        foreach ($field_data as $key => $value) {
           $sort_order[$key] = $value['sort_order'];
        }
        array_multisort($sort_order, SORT_ASC, $field_data);
        $this->data['fields'] = array();
        foreach ($field_data as $field) {
           $this->data['fields'][] = $field;
        }

产品视图：

<?php foreach ($fields as $field) { ?>
          <?php if ($field['status'] && (!empty($field['value']) || !empty($field['values']))) { ?>
             <?php $selected = false; ?>
             <?php if ($field['type'] == 'select' || $field['type'] == 'radio') { ?>
              <?php foreach ($field['values'] as $value) { ?>
                <?php if ($value['selected'] && !$selected) { ?>
                  <?php $selected = true; ?>
                 <span><?php echo $field['name']; ?></span>
                <?php } ?>
                <?php if ($value['selected'] == $value['option_value_id']) { ?>
                 <?php echo $value['name']; ?>
                <?php } ?>
              <?php } ?><?php if ($selected) { ?><br /><?php } ?>
             <?php } elseif ($field['type'] == 'checkbox') { ?>
              <?php $checkbox_value = ''; ?>
              <?php foreach ($field['values'] as $value) { ?>
                <?php if ($value['selected'] && !$selected) { ?>
                  <?php $selected = true; ?>
                 <span><?php echo $field['name']; ?></span>
                <?php } ?>
                <?php if ($value['selected'] == $value['option_value_id']) { ?>
                 <?php $checkbox_value .= $value['name'] . ', '; ?>
                <?php } ?>
              <?php } ?>
              <?php echo substr($checkbox_value, 0, -2); ?><?php if ($selected) { ?><br /><?php } ?>
             <?php } elseif ($field['type'] == 'file') { ?>
              <span><?php echo $field['name']; ?></span>
              <a href="index.php?route=product/product/download&file=<?php echo $field['value']; ?>"><?php echo $text_download; ?></a><br />
             <?php } else { ?>
              <span><?php echo $field['name']; ?></span>
              <?php echo $field['value']; ?><br />
             <?php } ?>
          <?php } ?>
        <?php } ?>

产品型号仅为：

'cpf'     => $query->row['cpf']

但是，在ADMIN产品模型中，会注入以下代码：

    if (isset($data['cpf'])) {          
                foreach ($data['cpf'] as $language_id => $cpf) {
                    $cpf = serialize($cpf);
                    $this->db->query("UPDATE " . DB_PREFIX . "product_description SET cpf = '" . $this->db->escape($cpf) . "' WHERE product_id = '" . (int)$product_id . "' AND language_id = '" . (int)$language_id . "'");
                }
            } else {
                $this->db->query("UPDATE " . DB_PREFIX . "product_description SET cpf = '' WHERE product_id = '" . (int)$product_id . "'");
            }

我的问题是，我如何获得这些相同的信息，并将其显示在另一个视图中，如类别、搜索或制造商？

非常感谢。