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Type:
Improvement
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Resolution: Duplicate
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Querying
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3
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please consider improving usage of find with fields parameter specified to handle DBRefs. This can be easy way to do joins automatically like this:
> db.foo.insert({a: 1});
> var a = db.foo.findOne();
> a
{ "_id" : ObjectId("4c67d3ae8d551a734559d73c"), "a" : 1 }
> db.foo.insert({b:2, a: new DBRef("foo", a._id)});
> var b = db.foo.findOne({b:2});
> b
{
"_id" : ObjectId("4c67d3ee8d551a734559d73d"),
"b" : 2,
"a" : {
"$ref" : "foo",
"$id" : ObjectId("4c67d3ae8d551a734559d73c")
}
}
improved find would be able to do this:
> var b = db.foo.findOne({b:2}, {b:1, "a.a": 1}); > b { "_id" : ObjectId("4c67d3ee8d551a734559d73d"), "b" : 2, "a" : { "_id" : ObjectId("4c67d3ae8d551a734559d73c"), "a" : 1} }
- duplicates
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SERVER-19095 $lookup
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- Closed
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- is related to
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- Closed
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- Closed
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