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aggregate ratings mongodb
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| // { | |
| // "result": [ | |
| // { | |
| // "_id": 5, | |
| // "count": 2 | |
| // }, | |
| // { | |
| // "_id": 4, | |
| // "count": 1 | |
| // } | |
| // ], | |
| // "ok": 1 | |
| // } | |
| db.ratings.aggregate([ | |
| {$match: {book: ObjectId("57e111142a52fe257e5d1d42")}}, | |
| {$group: {_id: "$value", count: {$sum: 1}}} | |
| ]) | |
| // { | |
| // "result": [ | |
| // { | |
| // "_id": 1, | |
| // "ratings": 1 | |
| // }, | |
| // { | |
| // "_id": 2, | |
| // "ratings": 2 | |
| // }, | |
| // { | |
| // "_id": 3, | |
| // "ratings": 2 | |
| // }, | |
| // { | |
| // "_id": 5, | |
| // "ratings": 11 | |
| // }, | |
| // { | |
| // "_id": 4, | |
| // "ratings": 4 | |
| // }, | |
| // { | |
| // "_id": 0, | |
| // "ratings": 31 | |
| // } | |
| // ], | |
| // "ok": 1 | |
| // } | |
| db.ratings.aggregate([ | |
| { $group: { | |
| _id: '$value', | |
| ratings: { $sum: 1 } | |
| }} | |
| ]) | |
| // { | |
| // "result": [ | |
| // { | |
| // "_id": ObjectId("57e6bef7cad79fa38555c643"), | |
| // "total": 2 | |
| // }, | |
| // { | |
| // "_id": ObjectId("57e111142a52fe257e5d1d42"), | |
| // "total": 2 | |
| // } | |
| // ], | |
| // "ok": 1 | |
| // } | |
| db.ratings.aggregate([ | |
| {$match: {book: {$in: [ObjectId("57e111142a52fe257e5d1d42"), ObjectId('57e6bef7cad79fa38555c643')]}}}, | |
| {$group: {_id: {book: "$book", value: "$value"} } }, | |
| {$group: {_id: "$_id.book", total: {$sum: 1}}}, | |
| ]) |
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