v0.0.4

cloudfunctions/feedList/index.js

@@ -0,0 +1,105 @@
+const cloud = require('wx-server-sdk')
+
+cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
+const db = cloud.database()
+const _ = db.command
+
+// Query a collection that may not exist yet (created lazily on first write).
+// Returns an empty result instead of throwing "collection not exists".
+async function safeGet(collection, where, limit = 200) {
+  try {
+    return await db.collection(collection).where(where).limit(limit).get()
+  } catch (e) {
+    return { data: [] }
+  }
+}
+
+function formatTimeText(ts) {
+  const diff = Date.now() - ts
+  const mins = Math.floor(diff / 60000)
+  if (mins < 1) return '刚刚'
+  if (mins < 60) return `${mins} 分钟前`
+  const hours = Math.floor(mins / 60)
+  if (hours < 24) return `${hours} 小时前`
+  const days = Math.floor(hours / 24)
+  if (days === 1) return '昨天'
+  if (days < 7) return `${days} 天前`
+  const d = new Date(ts)
+  return `${d.getMonth() + 1}月${d.getDate()}日`
+}
+
+exports.main = async event => {
+  const { OPENID } = cloud.getWXContext()
+  const pageSize = Math.min(event.pageSize || 20, 50)
+  const query = { visibility: 'public' }
+
+  if (event.topic) query.topics = event.topic
+
+  // Follow channel: only posts from users I follow (plus my own).
+  if (event.channel === 'follow') {
+    if (!OPENID) return { list: [], nextCursor: '' }
+    const meRes = await db.collection('users').where({ openid: OPENID }).limit(1).get()
+    if (!meRes.data.length) return { list: [], nextCursor: '' }
+    const meId = meRes.data[0]._id
+    const followRes = await safeGet('follows', { followerId: meId }, 500)
+    const authorOpenids = followRes.data.map(f => f.followeeOpenid).filter(Boolean)
+    authorOpenids.push(OPENID)
+    query.authorOpenid = _.in(authorOpenids)
+    query.visibility = _.in(['public', 'friends'])
+  }
+
+  if (event.cursor) {
+    query.createdAt = _.lt(Number(event.cursor))
+  }
+
+  const res = await db.collection('posts')
+    .where(query)
+    .orderBy('createdAt', 'desc')
+    .limit(pageSize)
+    .get()
+
+  if (!res.data.length) return { list: [], nextCursor: '' }
+
+  const postIds = res.data.map(p => p._id)
+
+  // Batch-check liked/favorited status — skip if no valid OPENID (non-WeChat context)
+  let likedSet = new Set()
+  let favSet = new Set()
+  if (OPENID) {
+    const [likedRes, favRes] = await Promise.all([
+      safeGet('postLikes', { openid: OPENID, postId: _.in(postIds) }),
+      safeGet('postFavorites', { openid: OPENID, postId: _.in(postIds) })
+    ])
+    likedSet = new Set(likedRes.data.map(l => l.postId))
+    favSet = new Set(favRes.data.map(f => f.postId))
+  }
+
+  const list = res.data.map(post => ({
+    _id: post._id,
+    author: {
+      id: post.authorId || '',
+      name: post.authorSnapshot?.name || '用户',
+      avatarKey: post.authorSnapshot?.avatarKey || 'gradient-avatar-1'
+    },
+    pet: post.petSnapshot || { name: '', breed: '' },
+    body: post.content || '',
+    topics: post.topics || [],
+    media: Array.isArray(post.media)
+      ? post.media.map(m => (typeof m === 'string' ? m : m && (m.url || m.fileId))).filter(Boolean)
+      : [],
+    mediaTone: post.mediaTone || 'pet-1',
+    sticker: post.sticker || undefined,
+    locationText: post.locationText || '',
+    timeText: formatTimeText(post.createdAt || Date.now()),
+    counts: {
+      likes: post.counts?.likes || 0,
+      comments: post.counts?.comments || 0,
+      favorites: post.counts?.favorites || 0
+    },
+    likedByMe: likedSet.has(post._id),
+    favoritedByMe: favSet.has(post._id)
+  }))
+
+  const last = res.data[res.data.length - 1]
+  return { list, nextCursor: last ? String(last.createdAt) : '' }
+}