79 lines
1.3 KiB
TypeScript
79 lines
1.3 KiB
TypeScript
![]() |
import Note from '../../../../models/note';
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/**
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* Get trends of hashtags
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*/
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module.exports = (params, user) => new Promise(async (res, rej) => {
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// 10分
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const interval = 1000 * 60 * 10;
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const data = await Note.aggregate([{
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$match: {
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createdAt: {
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$gt: new Date(Date.now() - interval)
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},
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tags: {
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$exists: true,
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$ne: []
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}
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}
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}, {
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$unwind: '$tags'
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}, {
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$group: {
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_id: '$tags',
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count: {
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$sum: 1
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}
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}
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}, {
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$group: {
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_id: null,
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tags: {
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$push: {
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tag: '$_id',
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count: '$count'
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}
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}
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}
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}, {
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$project: {
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_id: false,
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tags: true
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}
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}]) as Array<{
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tags: Array<{
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tag: string;
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count: number;
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}>
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}>;
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const hots = data[0].tags
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.sort((a, b) => a.count - b.count)
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.map(tag => tag.tag)
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.slice(0, 10);
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const countPromises: Array<Promise<number[]>> = [];
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for (let i = 0; i < 10; i++) {
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countPromises.push(Promise.all(hots.map(tag => Note.count({
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tags: tag,
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createdAt: {
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$lt: new Date(Date.now() - (interval * i)),
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$gt: new Date(Date.now() - (interval * (i + 1)))
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}
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}))));
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}
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const countsLog = await Promise.all(countPromises);
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const stats = hots.map((tag, i) => ({
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tag,
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chart: countsLog.map(counts => counts[i])
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}));
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console.log(stats);
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res(stats);
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});
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