Aggregate.limit

1. Interface Description

Function: Aggregation stage. Limits the number of records output to the next stage.

Declaration: limit(number)

2. Input Parameters

Parameter	Type	Required	Description
-	number	Yes	Positive integer

3. Response

Parameter	Type	Required	Description
-	Aggregate	Yes	Aggregation object

4. Sample Code

Suppose the collection items contains the following records:

{
  _id: "1",
  price: 10
}
{
  _id: "2",
  price: 50
}
{
  _id: "3",
  price: 20
}
{
  _id: "4",
  price: 80
}
{
  _id: "5",
  price: 200
}

Return the two smallest records with price greater than 20.

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("items")
    .aggregate()
    .match({
      price: _.gt(20),
    })
    .sort({
      price: 1,
    })
    .limit(2)
    .end();
  console.log(res.data);
};

The returned result is as follows:

{
  "_id": "3",
  "price": 20
}
{
  "_id": "4",
  "price": 80
}