修复动态发布与互动问题

cloudfunctions/matchLike/index.js

@@ -4,11 +4,25 @@ cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
 const db = cloud.database()
 const _ = db.command
 
+// Reading a collection that was never created throws in WeChat 云开发, and this
+// function reads `matches` before it ever adds to it — so the collection would
+// never get created and every "like" would fail. Create it up-front (no-op if it
+// already exists) to break that deadlock.
+async function ensureCollection(name) {
+  try {
+    await db.createCollection(name)
+  } catch (e) {
+    // Already-exists error is expected on every call after the first.
+  }
+}
+
 exports.main = async event => {
   const { OPENID } = cloud.getWXContext()
   const { petId } = event
   if (!petId) throw new Error('petId is required')
 
+  await ensureCollection('matches')
+
   // Get current user and their pets
   const userRes = await db.collection('users').where({ openid: OPENID }).limit(1).get()
   if (!userRes.data.length) throw new Error('user not found')