a303cf2d53
运行必须源码：app/(controller/model/service/middleware/lib/utils/validate/router)、config/、database/(migrations/seeders/sql)、启动脚本、app/public/templates 模板。 已忽略运行非必须：node_modules/、logs/、run/、app/public 运行时上传数据、.env*、构建/缓存产物。
133 lines
3.8 KiB
JavaScript
133 lines
3.8 KiB
JavaScript
'use strict';
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const Service = require('egg').Service;
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/**
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* 新闻服务 - NewsService
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*
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* 封装新闻相关的数据库查询操作。
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* 支持按组别过滤、按置顶过滤、分页查询。
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*/
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class NewsService extends Service {
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/**
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* 查询新闻列表（支持分页和过滤）
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*
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* 过滤参数：
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* - group: 组别筛选（如 zhongzhi, gaozhi, benke, jiaoshi），同时包含 group='all' 的通用新闻
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* - pinned: 是否仅查询置顶新闻（true/false）
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*
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* 排序规则：pinned DESC, publish_time DESC
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*
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* @param {Object} params - 查询参数
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* @param {string} [params.group] - 目标组别
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* @param {string|boolean} [params.pinned] - 是否只查置顶
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* @param {number} [params.page=1] - 页码
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* @param {number} [params.pageSize=20] - 每页数量
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* @returns {Promise<{list: Array, total: number, page: number, pageSize: number}>} 分页结果
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*/
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async list(params = {}) {
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const { ctx } = this;
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const { Sequelize } = ctx.app;
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const { group, pinned, page, pageSize } = params;
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// 分页参数，默认第 1 页，每页 20 条
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const currentPage = parseInt(page) || 1;
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const currentPageSize = parseInt(pageSize) || 20;
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const offset = (currentPage - 1) * currentPageSize;
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// 构建查询条件
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const where = {};
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// 组别过滤：同时包含指定组别和通用（all）新闻
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if (group) {
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where.group = {
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[Sequelize.Op.in]: [group, 'all'],
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};
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}
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// 置顶过滤
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if (pinned !== undefined && pinned !== null && pinned !== '') {
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where.pinned = pinned === 'true' || pinned === true;
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}
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// 构建查询
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const queryOptions = {
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where,
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order: [
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['pinned', 'DESC'],
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['sort_order', 'ASC'],
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['publish_time', 'DESC'],
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],
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attributes: ['id', 'title', 'content', 'publish_time', 'pinned', 'group', 'tags', 'sort_order', 'created_at', 'updated_at'],
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offset,
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limit: currentPageSize,
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};
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// 查询新闻列表和总数
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const [list, total] = await Promise.all([
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ctx.model.News.findAll(queryOptions),
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ctx.model.News.count({ where }),
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]);
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return {
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list,
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total,
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page: currentPage,
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pageSize: currentPageSize,
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};
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}
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/**
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* 获取各分组新闻计数（用于首页 Tab 显示数量）
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* @returns {Promise<Object>} { all: number, zhongzhi: number, gaozhi: number, benke: number, jiaoshi: number }
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*/
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async getGroupCounts() {
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const { ctx } = this;
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const { Sequelize } = ctx.app;
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const groups = ['all', 'zhongzhi', 'gaozhi', 'benke', 'jiaoshi'];
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const counts = { all: 0, zhongzhi: 0, gaozhi: 0, benke: 0, jiaoshi: 0 };
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// 并行查询各分组计数
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await Promise.all(groups.map(async group => {
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const where = {};
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// 对于具体组别，同时包含该组别和 all 通用新闻
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if (group !== 'all') {
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where.group = { [Sequelize.Op.in]: [group, 'all'] };
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}
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counts[group] = await ctx.model.News.count({ where });
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}));
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return counts;
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}
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/**
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* 根据 ID 查询新闻详情
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*
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* @param {number} id - 新闻 ID
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* @returns {Promise<Model|null>} 新闻模型对象或 null
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*/
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async findById(id) {
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const { ctx } = this;
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return await ctx.model.News.findOne({
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where: { id },
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attributes: ['id', 'title', 'content', 'publish_time', 'pinned', 'group', 'tags', 'sort_order', 'created_at', 'updated_at'],
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});
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}
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/**
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* 批量更新新闻排序
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* @param {Array<{id: number, sort_order: number}>} orders - 排序信息数组
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* @returns {Promise<void>}
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*/
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async updateSortOrder(orders) {
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const { ctx } = this;
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await Promise.all(orders.map(async ({ id, sort_order }) => {
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await ctx.model.News.update({ sort_order }, { where: { id } });
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}));
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}
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}
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module.exports = NewsService;
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