北斗导航定位通信综合实践赛服务系统

app/service/Contest.js

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+'use strict';
+
+const Service = require('../core/base_service');
+
+const { Op } = require('sequelize');
+
+const fileName = "Contest";
+
+class ContestService extends Service {
+    // 系统获取竞赛基本信息
+    async contestMsg(uid) {
+        const { ctx } = this;
+        try {
+            const user = await ctx.model4.Account.findOne({ attributes: ['contest_uid'], where: { uid } });
+            if (!user) return false;
+            const result = await ctx.model4.Contest.findOne({ where: { uid: user.dataValues.contest_uid }, order: [['created_at', 'DESC']] });
+            console.log(result)
+            return result || false;
+        } catch (error) {
+            const blockName = fileName + "--" + "contestMsg";
+            ctx.app.middleware.log('../../serviceLog', blockName + ">>>>" + error);
+            return 'error';
+        }
+    }
+
+    // 系统获取排名信息
+    async ranking(uid) {
+        const { ctx } = this;
+        try {
+            // 按得分降序排序，得分相同时按创建时间降序排序
+            let include = [
+                {
+                    model: ctx.model4.Account,
+                    attributes: ['account_name'],
+                }
+            ];
+            ctx.model4.Examination.belongsTo(ctx.model4.Account, { foreignKey: 'user_uid', targetKey: 'uid' });
+            const result = await ctx.model4.Examination.findAll({
+                attributes: ['score', 'created_at', 'updated_at'],
+                where: { updated_at: { [Op.ne]: null } },
+                // 先按得分降序排序
+                order: [['score', 'DESC'],],
+                limit: 100,
+                include,
+            });
+            if (result.length == 0) return false;
+            // 使用 Set 获取不同得分值
+            const uniqueScore = new Set(result.map(item => item.dataValues.score));
+            // 将 Set 转换为数组
+            const uniqueScoreArr = Array.from(uniqueScore);
+            // 对数组进行降序排序
+            uniqueScoreArr.sort((a, b) => b - a);
+            let allScoreArr = [];
+            uniqueScoreArr.forEach(score => {
+                let sameScoreArr = [];
+                result.forEach(item => {
+                    if (item.dataValues.score == score) {
+                        sameScoreArr.push(item);
+                        item.timeDifference = item.dataValues.updated_at - item.dataValues.created_at;
+                    }
+                });
+                // 按创建时间降序排序
+                sameScoreArr.sort((a, b) => b.timeDifference - a.timeDifference);
+                allScoreArr.push(...sameScoreArr);
+            });
+            return allScoreArr;
+        } catch (error) {
+            const blockName = fileName + "--" + "ranking";
+            ctx.app.middleware.log('../../serviceLog', blockName + ">>>>" + error);
+            return 'error';
+        }
+    }
+}
+
+module.exports = ContestService;