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Type: Bug
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Resolution: Done
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Priority: Minor - P4
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Affects Version/s: None
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Component/s: manual
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Labels:
To function properly, the nested expressions need to formatted in correct JSON, enclosed in their own objects.
The documentation shows the following short example:
$add:[5, $divide:[12, 2], 7]
To render correctly, the $divide command must be an object:
$add:[5, { $divide:[12, 2] }, 7]
Example: https://gist.github.com/2024712
Current location of documentation piece: http://www.mongodb.org/display/DOCS/Aggregation+Framework+-+Expression+Reference#AggregationFramework-ExpressionReference-Composition