修复云端数据一致性问题

cloudfunctions/tts/index.js

@@ -16,6 +16,7 @@
 // those prefixes are reserved by Tencent Cloud SCF. Use the TTS_ prefix.
 
 const cloud = require('wx-server-sdk')
+const { cachedFileId } = require('./cache')
 cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
 
 // Polished, fixed prompts.
@@ -90,7 +91,8 @@ exports.main = async (event) => {
   if (!resolvedFileID) {
     try {
       const r = await db.collection('tts_cache').doc(cacheKey).get()
-      if (r.data && r.data.length && r.data[0].fileID) resolvedFileID = r.data[0].fileID
+      const cached = cachedFileId(r.data)
+      if (cached) resolvedFileID = cached
     } catch (e) {}  // 集合/文档不存在,走合成
   }
   if (resolvedFileID) {