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db.command.aggregate.divide

1. Operator Description​

Function: Takes the dividend and divisor, and calculates the quotient.

Declaration: db.command.aggregate.divide([<dividend expression>, <divisor expression>])

2. Operator Parameters​

FieldTypeRequiredDescription
-<Array>ExpressionRequiredThe expression can be any expression that resolves to a number.

3. Sample Code​

Suppose the collection railroads contains the following records:

{ _id: 1, meters: 5300 }
{ _id: 2, meters: 64000 }
{ _id: 3, meters: 130 }

The value after converting each number to kilometers can be obtained as follows:

// Sample code in the Cloud Function environment
const tcb = require('@cloudbase/node-sdk')
const app = tcb.init({
  env: 'xxx'
})

const db = app.database()
const $ = db.command.aggregate

exports.main = async (event, context) => {
  const res = await db
    .collection('railroads')
    .aggregate()
    .project({
      km: $.divide(['$meters', 1000])
    })
    .end()
  console.log(res.data)
}

The returned result is as follows:

{ _id: 1, km: 5.3 }
{ _id: 2, km: 64 }
{ _id: 3, km: 0.13 }