db.command.aggregate.and
1. Operator Description
Description: Given multiple expressions, and
returns true
only if all expressions return true
; otherwise, it returns false
.
Declaration: db.command.aggregate.and([expression1, expression2, ...])
Notes:
If the expression returns
false
,null
,0
, orundefined
, it resolves tofalse
; otherwise, all other return values are consideredtrue
.
2. Operator Parameters
Field | Type | Required | Description |
---|---|---|---|
- | <Array>Expression | Required | aggregate expression |
3. Sample Code
Suppose the collection price
contains the following records:
{ "_id": 1, "min": 10, "max": 100 }
{ "_id": 2, "min": 60, "max": 80 }
{ "_id": 3, "min": 30, "max": 50 }
Find records where min
is greater than or equal to 30 and max
is less than or equal to 80.
// 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('price')
.aggregate()
.project({
fullfilled: $.and([$.gte(['$min', 30]), $.lte(['$max', 80])])
})
.end()
console.log(res.data)
}
The returned result is as follows:
{ "_id": 1, "fullfilled": false }
{ "_id": 2, "fullfilled": true }
{ "_id": 3, "fullfilled": true }