How to make child array pagination with node js and aws dynamo db - node.js

Question

I want to make pagination of "car_types" using aws dynamo db and node js. I don't want to use js, Can we make it using dynamo db ? I want total items, total page, page size, current page and data in response.
{
"uid": "222-3333",
"car_types": [
{
"description": "fsdf",
"title": "sdfsd"
},
{
"description": "fdfdfdf",
"title": "dfdfd"
},
{
"description": "dasda",
"title": "asdas"
},
{
"description": "dasd",
"title": "asdas"
},
{
"description": "dasdasd",
"title": "asdas"
}
]
}
Aws Dynamo DB and Node js Code, Which I used to get result.
export function get_car_types_list(){
var params = {
TableName : "cms_cars",
KeyConditionExpression: "#uid = :uid",
ExpressionAttributeNames:{
"#uid": "uid"
},
ExpressionAttributeValues: {
":uid": "222-3333"
}
};
return docClient.query(params).promise()
.then(function(data) {
console.log(data);
return data;
}).catch( (err) => {
console.log('got Error', err);
});
}
I want Result using dynamo db query:
{
"totalItem":5,
"totalPage":1,
"pageSize":"1",
"currentPage":"1",
"car_types": [
{
"description": "fsdf",
"title": "sdfsd"
},
{
"description": "fdfdfdf",
"title": "dfdfd"
},
{
"description": "dasda",
"title": "asdas"
},
{
"description": "dasd",
"title": "asdas"
},
{
"description": "dasdasd",
"title": "asdas"
}
]
}

Answer 1

DynamoDb will return 1 mb data when scan/query is executed, also LastEvaluatedKey is added to result if there are any remaining data. If you pass ExclusiveStartKey: LastEvaluatedKey you can scan/query with pagination. I added some tweaks to your approach, it may help you.
Edit: You can limit the result by passing Limit: Number to your params. This will allow you to limit the returning item count and you can get more with LastEvaluatedKey.
export function get_car_types_list(LastEvaluatedKey){
var params = {
TableName : "cms_cars",
KeyConditionExpression: "#uid = :uid",
ExpressionAttributeNames:{
"#uid": "uid"
},
ExpressionAttributeValues: {
":uid": "222-3333"
},
Limit: 5,
};
if (LastEvaluatedKey) {
params.ExclusiveStartKey = LastEvaluatedKey;
}
return docClient.query(params).promise()
.then(function(data) {
console.log(data);
return data;
}).catch( (err) => {
console.log('got Error', err);
});
}