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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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None
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Affects Version/s: 3.0.3
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Component/s: Aggregation Framework
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None
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Fully Compatible
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ALL
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None
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3
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I've been using MongoDB v3.0.3 and I tried the below codes. However $ifNull didn't fill the array. So I can't handle null Array issues;
Aggregation codes;
db.users.aggregate([{ $match: { "_id" : ObjectId("55d31f922d934c7007f048cf") } }, { $project: { 'solv': { $ifNull: [ '$solved', [{ point: 5 }] ] }, code:1 } }, {$group:{ _id:"$_id", score: { $sum: "$solv.point" } }}])
Console output;
{ "_id" : ObjectId("55d31f922d934c7007f048cf"), "score" : 0 }
Another aggregation without $group;
db.users.aggregate([{ $match: { "_id" : ObjectId("55d31f922d934c7007f048cf") } }, { $project: { 'solv': { $ifNull: [ '$solved', [{ point: "0" }] ] } } }])
Console output;
{ "_id" : ObjectId("55d31f922d934c7007f048cf"), "solv" : [ ] }
Not: I've tried by using MongoDB native driver and also Mongo console directly.
An example of Asya Kamsky:
http://stackoverflow.com/a/13898556/3765109