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MONGO - calculate the total of items from one array and another from another array
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| // Data | |
| // [ | |
| // { | |
| // "key": 1, | |
| // "seasons": [ | |
| // { | |
| // episodes: [ | |
| // 3, | |
| // 3 | |
| // ] | |
| // }, | |
| // { | |
| // episodes: [ | |
| // 3, | |
| // 3, | |
| // 1 | |
| // ] | |
| // }, | |
| // ] | |
| // }, | |
| // { | |
| // "key": 2, | |
| // "seasons": [ | |
| // { | |
| // episodes: [ | |
| // 3, | |
| // 3 | |
| // ] | |
| // } | |
| // ] | |
| // }, | |
| // { | |
| // "key": 1, | |
| // "seasons": [ | |
| // { | |
| // episodes: [ | |
| // 3, | |
| // 3 | |
| // ] | |
| // } | |
| // ] | |
| // } | |
| // ] | |
| db.collection.aggregate([ | |
| { | |
| "$match": { | |
| key: 1 | |
| } | |
| }, | |
| { | |
| "$unwind": "$seasons" | |
| }, | |
| { | |
| "$group": { | |
| "_id": null, | |
| "count": { | |
| $sum: { | |
| $size: "$seasons.episodes" | |
| } | |
| } | |
| } | |
| } | |
| ]) | |
| // [ | |
| // { | |
| // "_id": null, | |
| // "count": 7 | |
| // } | |
| // ] |
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