Multiple Group By with condition in MongoDB - mongodb

Question

I have the fields, group_id, category, account, sku and revenue. I want to do an aggregation where the revenue is grouped by the group_id, category, sku and account separately and in sku there will be two divisions, one where there is a comma and one where there isn't. How do I do this?
For example, if my data is
[
{
"group_id": "ABC",
"category": "test",
"account": "abc1",
"sku": "grre,qrvf",
"revenue": 100,
},
{
"group_id": "ABC2",
"category": "test",
"account": "abc",
"sku": "grre,qrvf",
"revenue": 100,
},
{
"group_id": "ABC3",
"category": "test2",
"account": "abc2",
"sku": "qwe",
"revenue": 100,
},
{
"group_id": "ABC",
"category": "test2",
"account": "abc",
"sku": "qwe",
"revenue": 100,
},
{
"group_id": "ABC2",
"category": "test3",
"account": "abc2",
"sku": "asd,fgh",
"revenue": 100,
},
{
"group_id": "ABC",
"category": "test3",
"account": "abc",
"sku": "asd,fgh",
"revenue": 100,
},
{
"group_id": "ABC3",
"category": "test",
"account": "abc2",
"sku": "grre,qrvf",
"revenue": 100,
}
]
then the result should be like
[
{groups: [{group_id: "ABC", "revenue": 300}, {group_id: "ABC2", "revenue": 200}, {group_id: "ABC3", "revenue": 200}]},
{categories: [{category: "test", "revenue": 300}, {category: "test2", "revenue": 200}, {category: "test3", "revenue": 200}]},
{accounts: [{account: "abc", "revenue": 300}, {account: "abc2", "revenue": 100}, {account: "abc3", "revenue": 300}]},
{skus: [{single: [{sku: "qwe", revenue: 100}, {sku: "iou", revenue: 100}]}, {multi: [{sku: "grre,qrvf", revenue: 300}, {sku: "asd,fgh", revenue: 200}]}]},
]

Answer 1

You can use $facet to run multiple aggregations separately in one round-trip and $indexOfBytes to split skus:
db.collection.aggregate([
{
$facet: {
group: [ { $group: { _id: "$group_id", revenue: { $sum: "$revenue" } } }, { $project: { _id: 0, group: "$_id", revenue: 1 } } ],
categories: [ { $group: { _id: "$category", revenue: { $sum: "$revenue" } } }, { $project: { _id: 0, category: "$_id", revenue: 1 } } ],
accounts: [ { $group: { _id: "$account", revenue: { $sum: "$revenue" } } }, { $project: { _id: 0, account: "$_id", revenue: 1 } } ],
skus: [
{ $group: { _id: "$sku", revenue: { $sum: "$revenue" } } },
{ $group: { _id: null, aggregates: { $push: { sku: "$_id", revenue: "$revenue" } } } },
{ $project: {
_id: 0,
single: { $filter: { input: "$aggregates", cond: { $eq: [ { $indexOfBytes: [ "$$this.sku", "," ] }, -1 ] } } },
multi: { $filter: { input: "$aggregates", cond: { $ne: [ { $indexOfBytes: [ "$$this.sku", "," ] }, -1 ] } } },
},
}
],
}
}
])
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