the data in the database is like this. There are decimals, and I need to sum them.
execute the following code:
bet.aggregate(
{
$match: {
state: { $in: [0, 1, 2, 3] }
}
},
{
$group: {
_id: { state: "$state" },
serviceCharge: { $sum: "$serviceCharge" },
percentage: { $sum: "$percentage" },
income:{ $sum: { $subtract: [ "$serviceCharge","$percentage"] } }
},
},
{ $project: { "_id": 0, "state": "$_id.state", "serviceCharge": 1, "percentage": 1 ,"income":1} },
(err, ret) => {
console.log(ret)
})
is:
[
{serviceCharge: 6, percentage: 0, income: 6, state: 2},
{serviceCharge: 57, percentage: 38, income: 19, state: 0}
]
Why is the result an integer? Solve!