1 var rs = db.fs.files.aggregate([
2 {$group: {_id: '$metadata.cas', count: {$sum: 1}}},
3 {$match: {count: {$gt: 1}}}
4 ])
5
6 //print(rs);
7 for(var i in rs.result){
8 var count = rs.result[i].count;
9 var id = rs.result[i]._id;
10
11 for(var j = 0; j < count - 1; j ++){
12 db.fs.files.remove({'metadata.cas': id}, true);
13 }
14 }
1 db.runCommand({group: {
2 ns: 'fs.files',
3 key: {},
4 initial: {'result': {}},
5 $reduce: function(doc, out){
6 if(doc.metadata.cas in out.result){
7 out.result[doc.metadata.cas] ++;
8 }else{
9 out.result[doc.metadata.cas] = 1;
10 }
11 },
12 finalize: function(out){
13 for(key in out.result){
14 if(out.result[key] <= 1){
15 delete out.result[key];
16 }
17 }
18 }
19 }})
