How can an admin delete any comments on a specific post on codeigniter?

Question

CodeIgniter

Help, it is necessary for the admin to be able to delete any comments on a certain post,
Here's what happened, but it doesn't work...
And how can I edit comments in the future?
Model for getting comments with pagination:

public function view($slug = NULL, $offset=0) {
    $this->data['posts_item'] = $this->posts_model->getPosts($slug); //обращение к нашей модели
    $post_slug = $this->posts_model->getPosts($slug); 

    if (empty($this->data['posts_item'])) {
      //show_404();
      $this->load->helper('url_helper');
      redirect('/', 'location');
    }
    

    //вызовем модель для комментов
    $this->load->model('comments_model');
    $this->data['comments'] = $this->comments_model->getComments($post_slug['id']);

    $this->data['id'] = $post_slug['id'];
    $this->data['slug'] = $this->data['posts_item']['slug'];
    $this->data['title'] = $this->data['posts_item']['title'];
    $this->data['content'] = $this->data['posts_item']['text'];
    $this->data['author_post'] = $this->data['posts_item']['author'];
    $this->data['date'] = $this->data['posts_item']['date'];

    
    // Настройки пагинации
    $data_cmts = $this->db
    ->where('post_id', $post_slug['id'])
    ->get("comments");

    $config['total_rows'] = $data_cmts->num_rows();
    $config['base_url'] = base_url(). 'index.php/posts/view/'.$slug;
    $config['per_page'] = 5;
    $config['first_link'] = 'Первая';
    $config['last_link'] = 'Последняя';
    $config['first_url'] = '0'; 

    //pagination bootstrap
    $config['full_tag_open'] = "<ul class='pagination pull-right'>";
    $config['full_tag_close'] ="</ul>";
    $config['num_tag_open'] = '<li>';
    $config['num_tag_close'] = '</li>';
    $config['cur_tag_open'] = "<li class='disabled'><li class='active'><a href='#'>";
    $config['cur_tag_close'] = "<span class='sr-only'></span></a></li>";
    $config['next_tag_open'] = "<li>";
    $config['next_tagl_close'] = "</li>";
    $config['prev_tag_open'] = "<li>";
    $config['prev_tagl_close'] = "</li>";
    $config['first_tag_open'] = "<li>";
    $config['first_tagl_close'] = "</li>";
    $config['last_tag_open'] = "<li>";
    $config['last_tagl_close'] = "</li>";

    //init pagination
    $this->pagination->initialize($config);
    $this->data['pagin_liks'] = $this->pagination->create_links();
    $this->data['offset'] = $offset;
    $this->data['arr_comments'] = $this->comments_model->getCommentsOnPage($post_slug['id'], $config['per_page'], $offset);


    $this->load->view('templates/header', $this->data);
    $this->load->view('posts/view', $this->data);
    $this->load->view('templates/footer');

  }

Controller for deleting comments:

public function delComment($post_id=NULL) {
    if(!$this->dx_auth->is_admin()) {
      show_404();
    }

    $this->data['comments_delete'] = $this->comments_model->getCommentsOnPage($post_id, $per_page, $offset);

    if (empty($this->data['comments_delete'])) {
      show_404();
    }
    $this->data['result'] = "Ошибка удаления ";

    if($this->comments_model->delComments($post_id)) {
      $this->data['result'] = " Успешно удалён";
    }

    $this->load->view('templates/header', $this->data);
    $this->load->view('comment/delete', $this->data);
    $this->load->view('templates/footer');
  }

model for deleting comments:

public function delCommentsOnPage($post_id, $per_page, $offset) {
    return $this->db->delete('comments', array('post_id' => $post_id));
  }

view:

<?php foreach ($arr_comments as $cmts): ?>
  <div class="panel panel-info">
  <div class="panel-heading"><i class="glyphicon glyphicon-user"></i> <?php echo getUserNameById($cmts->user_id)->username; ?></div>
  <div class="panel-body">
      <?php echo $cmts->comment_text ?>
      <a href="/posts/view/<?php echo $slug; ?>/delComment/<?php echo $post-id ?>">Удалить</a> 
  </div>
  </div>
<?php endforeach ?>

<?php echo $pagin_liks; ?>