overleaf/services/web/migrations/20200210084301_remove-duplicate-deleted-things.mjs

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/* eslint-disable no-unused-vars */
const tags = ['server-ce', 'server-pro', 'saas']
async function removeDuplicates(collection, field) {
const duplicates = await collection.aggregate(
[
{
$group: {
_id: { projectId: `$deleterData.${field}` },
dups: { $addToSet: '$_id' },
count: { $sum: 1 },
},
},
{ $match: { count: { $gt: 1 } } },
],
{ allowDiskUse: true }
)
let duplicate
while ((duplicate = await duplicates.next())) {
// find duplicate items, ignore the most recent and delete the rest
const items = await collection
.find(
{ _id: { $in: duplicate.dups } },
{ projection: { _id: 1 }, sort: { 'deleterData.deletedAt': -1 } }
)
.toArray()
items.pop()
const ids = items.map(item => item._id)
await collection.deleteMany({ _id: { $in: ids } })
}
}
const migrate = async client => {
const { db } = client
await removeDuplicates(db.deletedProjects, 'deletedProjectId')
await removeDuplicates(db.deletedUsers, 'deletedUserId')
}
const rollback = async client => {
// can't really do anything here
}
export default {
tags,
migrate,
rollback,
}