db.command.aggregate.gt

1. Operator Description

Function: Compares two values and returns true if the former is greater than the latter, otherwise returns false.

Declaration: db.command.aggregate.gt([value1, value2])

2. Operator Parameters

Field	Type	Required	Description
-	<Array>Expression	Required	array of aggregate expressions

3. Sample Code

Suppose the collection price contains the following records:

{ "_id": 1, "value": 10 }
{ "_id": 2, "value": 80 }
{ "_id": 3, "value": 50 }

Check whether value is greater than 50.

// 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
const _ = db.command

exports.main = async (event, context) => {
  const res = await db
    .collection('price')
    .aggregate()
    .project({
      matched: $.gt(['$value', 50])
    })
    .end()
  console.log(res.data)
}

The returned result is as follows:

{ "_id": 1, "matched": false }
{ "_id": 2, "matched": true }
{ "_id": 3, "matched": false }