调用关注问题的人后台加个数据查询显示限制吧，有些帖子上千人回了查询起来太利害，数据查询有待优化

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调用关注问题的人后台加个数据查询显示限制吧，有些帖子上千人回了查询起来太利害，数据查询有待优化

性能优化

	public function get_focus_users_action()
	{
		$focus_users = array();
		
		if ($focus_users_info = $this->model('question')->get_focus_users_by_question($_GET['question_id']))
		{
			$question_info = $this->model('question')->get_question_info_by_id($_GET['question_id']);//为什么不直接定在main.php文件直接调用而写在ajax.php文件里又要去查询问题表，这个查询不是重复了吗？
			
			foreach($focus_users_info as $key => $val)
			{
				if ($val['uid'] == $question_info['published_uid'] and $question_info['anonymous'] == 1)
				{
					$focus_users[$key] = array(
						'uid' => 0,
						'user_name' => AWS_APP::lang()->_t('匿名用户'),
						'avatar_file' => get_avatar_url(0, 'mid'),
					);
				}
				else
				{
					$focus_users[$key] = array(
						'uid' => $val['uid'],
						'user_name' => $val['user_name'],
						'avatar_file' => get_avatar_url($val['uid'], 'mid'),
						'url' => get_js_url('/people/' . $val['url_token'])
					);
				}
			}
		}
		
		H::ajax_json_output($focus_users);
	}

$question_info = $this->model('question')->get_question_info_by_id($_GET['question_id']);//为什么不直接定在main.php文件直接调用而写在ajax.php文件里又要去查询问题表，这个查询不是重复了吗？