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payacom
321
utils/reelsTabFeed.js
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321
utils/reelsTabFeed.js
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const UserFollowModel = require('../models/UserFollowModel')
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const NEAR_ME_RADIUS_METERS = 5000
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const PostBookmarkModel = require('../models/PostBookmarkModel')
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const PostModel = require('../models/PostModel')
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const UserModel = require('../models/UserModel')
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const LikeModel = require('../models/LikeModel')
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const ExploreInteractionModel = require('../models/ExploreInteractionModel')
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const { getBlockerUserIds } = require('./blockVisibility')
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const { filterPostsByDistance } = require('./nearbyPosts')
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const { postStatusFilter } = require('./moderationStatus')
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const { buildUnifiedInterestScore } = require('./exploreAlgorithm')
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async function getSuggestedFollowUsers(userId, limit = 15) {
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const viewer = await UserModel.findById(userId)
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.select('expertise blocked_users')
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.lean()
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const following = await UserFollowModel.find({ followerId: userId })
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.select('followingId')
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.lean()
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const excludeIds = new Set(
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following.map((f) => String(f.followingId)).concat(String(userId))
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)
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const blockerIds = new Set(
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(await getBlockerUserIds(UserModel, userId)).map(String)
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)
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const [interactions, likedPosts, interestWeights] = await Promise.all([
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ExploreInteractionModel.find({ viewerId: userId })
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.sort({ createdAt: -1 })
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.limit(40)
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.select('targetId authorId action')
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.lean(),
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LikeModel.find({ userId })
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.sort({ createdAt: -1 })
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.limit(30)
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.select('postId')
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.lean(),
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// شخصیسازی متقابل: علایقی که کاربر توی فروشگاه/آموزش/بیلبورد نشون داده هم اینجا اثر بذاره
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buildUnifiedInterestScore(userId),
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])
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const interactedAuthorIds = new Set()
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interactions.forEach((row) => {
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if (row.authorId) interactedAuthorIds.add(String(row.authorId))
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})
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const likedPostIds = likedPosts.map((l) => l.postId).filter(Boolean)
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if (likedPostIds.length) {
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const likedPostsData = await PostModel.find({ _id: { $in: likedPostIds } })
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.select('user_id')
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.lean()
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likedPostsData.forEach((p) => interactedAuthorIds.add(String(p.user_id)))
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}
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let preferredExpertises = new Set()
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if (viewer?.expertise) preferredExpertises.add(viewer.expertise)
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if (interactedAuthorIds.size) {
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const authors = await UserModel.find({
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_id: { $in: [...interactedAuthorIds] },
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})
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.select('expertise')
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.lean()
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authors.forEach((a) => {
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if (a.expertise) preferredExpertises.add(a.expertise)
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})
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}
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const candidates = await UserModel.find({
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_id: { $nin: [...excludeIds] },
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user_name: { $nin: [null, ''] },
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})
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.select(
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'_id user_name first_name last_name expertise profile_image user_level'
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)
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.limit(120)
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.lean()
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const filtered = candidates.filter(
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(u) => !blockerIds.has(String(u._id)) && !excludeIds.has(String(u._id))
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)
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if (!filtered.length) return []
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const candidateIds = filtered.map((u) => u._id)
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const recentPosts = await PostModel.find({
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user_id: { $in: candidateIds },
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status: postStatusFilter(),
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is_archived: { $ne: true },
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})
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.sort({ createdAt: -1 })
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.lean()
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const postByUser = {}
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for (const p of recentPosts) {
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const uid = String(p.user_id)
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if (!postByUser[uid]) postByUser[uid] = p
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}
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const scored = filtered
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.filter((u) => postByUser[String(u._id)])
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.map((u) => {
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let score = Math.random() * 2
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if (preferredExpertises.has(u.expertise)) score += 8
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if (interactedAuthorIds.has(String(u._id))) score += 12
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if (u.expertise && interestWeights[u.expertise]) {
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score += Math.min(20, interestWeights[u.expertise])
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}
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const post = postByUser[String(u._id)]
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score += (post.likes?.length || 0) * 0.15
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return { user: u, score, previewPost: postByUser[String(u._id)] }
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})
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.sort((a, b) => b.score - a.score)
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.slice(0, limit)
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return scored.map(({ user, previewPost }) => ({
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_id: user._id,
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user_name: user.user_name,
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first_name: user.first_name,
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last_name: user.last_name,
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expertise: user.expertise,
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user_level: user.user_level,
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profile_image: user.profile_image,
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previewPost: {
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_id: previewPost._id,
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type: previewPost.type,
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files: previewPost.files,
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caption: previewPost.caption,
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},
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is_following: false,
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}))
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}
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async function getFollowingReelsFeed({
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userId,
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page,
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limit,
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postFilter,
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mapPostsWithUsers,
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}) {
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const follows = await UserFollowModel.find({ followerId: userId })
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.select('followingId')
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.lean()
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const followingIds = follows.map((f) => f.followingId)
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if (!followingIds.length) {
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const suggestedUsers = await getSuggestedFollowUsers(userId)
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return {
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posts: [],
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totalPages: 0,
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totalItems: 0,
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feedMeta: { emptyFollowing: true, suggestedUsers },
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}
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}
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const suggestedUsers = await getSuggestedFollowUsers(userId)
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let posts = await PostModel.find({
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...postFilter,
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status: postStatusFilter(),
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user_id: { $in: followingIds },
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})
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.sort({ createdAt: -1 })
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.lean()
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const userIds = [...new Set(posts.map((p) => String(p.user_id)))]
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const users = await UserModel.find({ _id: { $in: userIds } })
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.select(
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'_id user_name first_name last_name expertise sub_expertise province city user_level show_location profile_image is_verified user_score rate blocked_users'
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)
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.lean()
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posts = await mapPostsWithUsers(posts, users, { id: userId })
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const totalItems = posts.length
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const pageNum = parseInt(page, 10) || 1
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const limitNum = parseInt(limit, 10) || 10
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const startIndex = (pageNum - 1) * limitNum
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const paginatedPosts = posts.slice(startIndex, startIndex + limitNum)
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return {
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posts: paginatedPosts,
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totalPages: Math.ceil(totalItems / limitNum) || 1,
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totalItems,
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feedMeta: { emptyFollowing: false, suggestedUsers },
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}
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}
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async function getSavedReelsFeed({
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userId,
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page,
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limit,
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postFilter,
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mapPostsWithUsers,
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}) {
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const pageNum = Math.max(1, parseInt(page, 10) || 1)
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const limitNum = Math.min(30, Math.max(1, parseInt(limit, 10) || 10))
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const skip = (pageNum - 1) * limitNum
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const totalItems = await PostBookmarkModel.countDocuments({ userId })
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const bookmarks = await PostBookmarkModel.find({ userId })
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.sort({ createdAt: -1 })
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.skip(skip)
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.limit(limitNum)
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.lean()
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const postIds = bookmarks.map((b) => b.postId)
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if (!postIds.length) {
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return {
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posts: [],
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totalPages: Math.ceil(totalItems / limitNum) || 0,
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totalItems,
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feedMeta: { emptySaved: true },
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}
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}
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let posts = await PostModel.find({
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_id: { $in: postIds },
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status: postStatusFilter(),
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...postFilter,
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}).lean()
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const orderMap = new Map(postIds.map((id, idx) => [String(id), idx]))
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posts.sort(
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(a, b) =>
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(orderMap.get(String(a._id)) ?? 0) - (orderMap.get(String(b._id)) ?? 0)
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)
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const userIds = [...new Set(posts.map((p) => p.user_id))]
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const users = await UserModel.find({ _id: { $in: userIds } })
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.select(
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'_id user_name first_name last_name expertise sub_expertise province city user_level show_location profile_image is_verified user_score rate blocked_users'
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)
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.lean()
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posts = await mapPostsWithUsers(posts, users, { id: userId })
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return {
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posts,
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totalPages: Math.ceil(totalItems / limitNum) || 1,
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totalItems,
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feedMeta: { emptySaved: totalItems === 0 },
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}
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}
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async function getNearMeReelsFeed({
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lat,
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lng,
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page,
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limit,
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postFilter,
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mapPostsWithUsers,
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decodedToken,
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}) {
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const parsedLat = parseFloat(lat)
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const parsedLng = parseFloat(lng)
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if (!Number.isFinite(parsedLat) || !Number.isFinite(parsedLng)) {
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return {
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posts: [],
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totalPages: 0,
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totalItems: 0,
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feedMeta: { needsLocation: true },
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}
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}
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let posts = await PostModel.find({
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...postFilter,
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status: postStatusFilter(),
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lat: { $nin: [null, ''] },
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lng: { $nin: [null, ''] },
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})
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.sort({ createdAt: -1 })
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.lean()
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posts = filterPostsByDistance(
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posts,
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parsedLat,
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parsedLng,
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NEAR_ME_RADIUS_METERS
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)
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if (!posts.length) {
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return {
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posts: [],
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totalPages: 0,
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totalItems: 0,
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feedMeta: { emptyNearMe: true },
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}
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}
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const userIds = [...new Set(posts.map((p) => p.user_id))]
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const users = await UserModel.find({ _id: { $in: userIds } })
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.select(
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'_id user_name first_name last_name expertise sub_expertise province city user_level show_location profile_image is_verified user_score rate lat lng blocked_users'
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)
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.lean()
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posts = await mapPostsWithUsers(posts, users, decodedToken)
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const totalItems = posts.length
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const pageNum = parseInt(page, 10) || 1
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const limitNum = parseInt(limit, 10) || 10
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const startIndex = (pageNum - 1) * limitNum
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const paginatedPosts = posts.slice(startIndex, startIndex + limitNum)
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return {
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posts: paginatedPosts,
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totalPages: Math.ceil(totalItems / limitNum) || 1,
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totalItems,
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feedMeta: { emptyNearMe: totalItems === 0 },
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}
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}
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module.exports = {
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getSuggestedFollowUsers,
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getFollowingReelsFeed,
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getSavedReelsFeed,
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getNearMeReelsFeed,
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}
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Reference in New Issue
Block a user