Last active
September 25, 2016 13:20
-
-
Save ktkaushik/f2a5bf34ef847f5c9af7f2598e76482d to your computer and use it in GitHub Desktop.
aggregate ratings mongodb
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // { | |
| // "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}}}, | |
| ]) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment