84 lines
2.5 KiB
JavaScript
84 lines
2.5 KiB
JavaScript
const cloud = require('wx-server-sdk')
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cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
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const db = cloud.database()
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const _ = db.command
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const PAGE_SIZE = 10
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exports.main = async (event, context) => {
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const { OPENID } = cloud.getWXContext()
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const { page = 0, type = 'hot', userId, latitude, longitude } = event
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try {
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let query = db.collection('posts')
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const skip = page * PAGE_SIZE
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if (userId) {
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// 某用户的帖子
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query = query.where({ authorId: userId })
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} else if (type === 'feed') {
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// 关注的用户帖子
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const followsRes = await db.collection('follows')
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.where({ followerId: OPENID })
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.field({ followeeId: true })
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.get()
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const followeeIds = followsRes.data.map(f => f.followeeId)
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followeeIds.push(OPENID)
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query = query.where({ authorId: _.in(followeeIds) })
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} else if (type === 'nearby' && latitude && longitude) {
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// 附近帖子：使用地理围栏查询（简化版，用 geo_near）
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query = query.where(
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_.and([
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{ 'location.latitude': _.gt(latitude - 0.1) },
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{ 'location.latitude': _.lt(latitude + 0.1) },
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{ 'location.longitude': _.gt(longitude - 0.15) },
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{ 'location.longitude': _.lt(longitude + 0.15) },
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])
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)
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}
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// type === 'hot' 全量按热度排序
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const total = await query.count()
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const postsRes = await query
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.orderBy('createdAt', 'desc')
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.skip(skip)
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.limit(PAGE_SIZE)
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.get()
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const posts = postsRes.data
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// 批量获取作者信息
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const authorIds = [...new Set(posts.map(p => p.authorId))]
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const authorsRes = await db.collection('users')
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.where({ openid: _.in(authorIds) })
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.field({ nickName: true, avatarUrl: true, openid: true, pets: true, location: true })
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.get()
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const authorMap = {}
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authorsRes.data.forEach(u => { authorMap[u.openid] = u })
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// 获取当前用户点赞状态
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const postIds = posts.map(p => p._id)
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const likesRes = await db.collection('likes')
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.where({ userId: OPENID, postId: _.in(postIds) })
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.field({ postId: true })
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.get()
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const likedSet = new Set(likesRes.data.map(l => l.postId))
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const enriched = posts.map(p => ({
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...p,
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author: authorMap[p.authorId] || null,
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isLiked: likedSet.has(p._id),
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}))
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return {
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code: 0,
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data: {
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list: enriched,
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total: total.total,
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hasMore: skip + posts.length < total.total,
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},
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}
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} catch (e) {
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return { code: -1, message: e.message }
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}
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}
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