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Type:
Improvement
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Resolution: Unresolved
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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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Query Optimization
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0
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It isn't possible to insert a document with a $ref key at the top-level, so there's no way for the query to ever match anything.
> db.mycoll.insert({$ref: 'mycoll', $id: 1})
WriteResult({
"nInserted" : 0,
"writeError" : {
"code" : 2,
"errmsg" : "Document can't have $ prefixed field names: $ref"
}
})