codemash-mongodb-aggregate-framework

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- $match - Filter documents - Uses existing query syntax - geospatial - $project - Reshape documents - Include, exclude or rename fields - Inject computed fields - Create sub-document fields - $group - Group documents by an ID - Other output fields are computed - Processes all data in memory - $unwind - Operate on an array field - Yield new documents for each array element - Pipe to $group to aggregate documents - $sort, $limit, $skip - Sort documents by one or more fields - Limit and skip follow cursor

https://github.com/doowb/codemash-mongodb-aggregate-framework

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