点击一个栏目进去后显示当前栏目第一篇文章的内容的设计方法

模块目录：news

修改文件：dayrui/App/News/Controllers/Category.php

<?php namespace Phpcmf\Controllers;

/**
 * 二次开发时可以修改本文件，不影响升级覆盖
 */

class Category extends \Phpcmf\Home\Module
{

    public function index() {
        $page = max(1, (int)\Phpcmf\Service::L('Input')->get('page'));
        // 初始化模块
        $this->_module_init();
        $catid = (int)\Phpcmf\Service::L('Input')->get('id');
        $catdir = dr_safe_replace(\Phpcmf\Service::L('Input')->get('dir'));

        if ($catid) {
            $category = $this->module['category'][$catid];
            if (!$category) {
                $this->goto_404_page(dr_lang('模块【%s】栏目（%s）不存在', $this->module['dirname'], $catid));
                return;
            }
        } elseif ($catdir) {
            $catid = intval($this->module['category_dir'][$catdir]);
            $category = $this->module['category'][$catid];
            if (!$category) {
                // 无法通过目录找到栏目时，尝试多及目录
                foreach ($this->module['category'] as $t) {
                    if ($t['setting']['urlrule']) {
                        $rule = \Phpcmf\Service::L('cache')->get('urlrule', $t['setting']['urlrule']);
                        $rule['value']['catjoin'] = '/';
                        if ($rule['value']['catjoin'] && strpos($catdir, $rule['value']['catjoin'])) {
                            $catdir = trim(strchr($catdir, $rule['value']['catjoin']), $rule['value']['catjoin']);
                            if (isset($this->module['category_dir'][$catdir])) {
                                $catid = $this->module['category_dir'][$catdir];
                                $category = $this->module['category'][$catid];
                                break;
                            }
                        }
                    }
                }
                // 返回无法找到栏目
                if (!$category) {
                    $this->goto_404_page(dr_lang('模块【%s】栏目（%s）不存在', $this->module['dirname'], $catdir));
                    return;
                }
            }
        } else {
            $this->goto_404_page(dr_lang('模块【%s】栏目不存在', $this->module['dirname']));
            return;
        }

        $row = \Phpcmf\Service::M()->table(SITE_ID.'_'.MOD_DIR)->where_in('catid', $category['catids'])->order_by('updatetime desc')->getRow();
        if (!$row) {
            $this->goto_404_page(dr_lang('模块【%s】栏目（%s）没有内容', $this->module['dirname'], $catid));
            return;
        }
        
        $this->_Show($row['id'], [], $page);
    }

}

查询栏目的第一条内容，按时间排序的