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cloudfunctions/updateLocation/index.js

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+// 云函数入口文件
+const cloud = require('wx-server-sdk')
+
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
+const db = cloud.database()
+const _ = db.command
+
+exports.main = async (event, context) => {
+    const wxContext = cloud.getWXContext()
+    const openid = wxContext.OPENID
+
+    const { roomId, location } = event
+    // location format: { lng: 116.1, lat: 39.1, address: "...", name: "..." }
+
+    if (!roomId || !location) {
+        return { success: false, msg: '缺少参数' }
+    }
+
+    try {
+        // 2026-02-02 Fix: 使用 Read-Modify-Write 模式避免复杂更新操作符报错
+        // 先读取房间数据
+        const roomRes = await db.collection('rooms').doc(roomId).get()
+        const roomData = roomRes.data
+
+        if (!roomData) {
+            return { success: false, msg: '房间不存在' }
+        }
+
+        const members = roomData.members || []
+        const memberIndex = members.findIndex(m => m.openid === openid)
+
+        if (memberIndex === -1) {
+            return { success: false, msg: '您尚未加入该房间' }
+        }
+
+        // 直接修改内存中的数组对象
+        members[memberIndex].location = location
+
+        // 2026-02-02 Fix: 使用 _.set 强制覆写 members 字段，解决 DuplicateWrite 索引冲突问题
+        // 这通常是因为数据结构不一致或底层索引冲突导致的，set 指令会完全替换字段值
+        await db.collection('rooms').doc(roomId).update({
+            data: {
+                members: _.set(members)
+            }
+        })
+
+        return {
+            success: true,
+            msg: '位置更新成功'
+        }
+
+    } catch (err) {
+        console.error(err)
+        return {
+            success: false,
+            msg: '位置更新失败',
+            error: err
+        }
+    }
+}