如何使用猫鼬（NodeJS）删除 mongoDB 中的重复项

Question

I have a collection in MongoDB where there are around (~200k records). My sample record would look like,

{
    name:String,
    slug:String,
    metaDes:String,
    content:String,
    parentID:String,
    thumbnail:String,
    display:Boolean,
}

I am having a lot of duplicate records in the collection having same slug

I want to remove duplicate records based on slug Is there any fast way to remove all duplicates with mongoose(Nodejs)? Thanks!

Answer 1

Remove duplicate records in the collection having the same slug

 db.table.aggregate([ { "$group": { _id: {slug: "$slug"}, slugs: { $addToSet: "$_id" }, count: { $sum: 1 } } }, { "$match": { count: { "$gt": 1 } } } ]).forEach(function(doc) { doc.slugs.shift(); db.table.remove({ _id: {$in: doc.slugs} }); })

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