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December 30, 2015 05:59
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Count mongo subarrays with filter by _id and subarray type
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| myres = db.tag_ru.aggregate( | |
| { $match: {_id: 1354987}}, | |
| { $unwind: '$items'}, | |
| { $match: {'items.type': "news"}}, | |
| { $group: {_id: '$_id', items: {$sum: '$items'}}}) | |
| myres.result[0].items.length |
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