MaxInterview - mongodb delete duplicate documents

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1var duplicates = [];
2db.collectionName.aggregate([
3  { $match: { 
4    name: { "$ne": '' }  // discard selection criteria
5  }},
6  { $group: { 
7    _id: { name: "$name"}, // can be grouped on multiple properties 
8    dups: { "$addToSet": "$_id" }, 
9    count: { "$sum": 1 } 
10  }}, 
11  { $match: { 
12    count: { "$gt": 1 }    // Duplicates considered as count greater than one
13  }}
14],
15{allowDiskUse: true}       // For faster processing if set is larger
16)               // You can display result until this and check duplicates 
17.forEach(function(doc) {
18    doc.dups.shift();      // First element skipped for deleting
19    doc.dups.forEach( function(dupId){ 
20        duplicates.push(dupId);   // Getting all duplicate ids
21        }
22    )    
23})
24// If you want to Check all "_id" which you are deleting else print statement not needed
25printjson(duplicates);     
26// Remove all duplicates in one go    
27db.collectionName.remove({_id:{$in:duplicates}})

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