Postman: Example request body created in Javascript

1-Load_data.postman.js

// 1. First route: Get data and index them in Postman Variable
// Set this content in Request > "Tests" Tab

// Step: You can get barcode with Sale > Get by ID
var jsonData = JSON.parse(responseBody);

if (jsonData.data.idSale) {
    postman.setEnvironmentVariable("saleId", jsonData.data.idSale);
}

if (jsonData.data.saleItems) {
    saleItems = [];
    complements = [];
    jsonData.data.saleItems.forEach(function(element) {
        if (element.type !== 'ENT') { // element.type !== 'CMP'
            return;
        }

        item = {
	        "id": element.id,
	        "idBookingItem": element.idBookingItem,
	        "pricingCode": element.pricingCode,
	        "idTicket": element.idTicket,
            "idSeat" : (element.seat && element.seat.id) ? element.seat.id : null,
	        "idShowtime" : (element.showtimeInfo && element.showtimeInfo.idShowtime) ? element.showtimeInfo.idShowtime : null
        };

        saleItems.push(item);
    });
    postman.setEnvironmentVariable("bookingSaleItems", JSON.stringify(saleItems));
}

if (jsonData.data.complements) {
    complements = [];

    jsonData.data.complements.forEach(function(element) {
        quantity = (element.quantity - element.quantityOnlineControlled - element.quantityCancelled);
        if (quantity == 0) {
            return true;
        } else if (quantity < 0) {
            window.alert('Quantity ' + quantity + ' incorrect for complement ID: ' + id);
        }

        item = {
	        "id": element.id,
            "quantity": quantity
        };

        complements.push(item);
    });
    postman.setEnvironmentVariable("bookingComplements", JSON.stringify(complements));
}

2-pre-request-script.postman.js

// 2. Second route: Use postman Variable to body content
// Set this content in Request > "Pre-Request Script" Tab

// Step1: You can get barcode with Sale > Get by ID
// Step2: You must use the "Load Data" request before launch this script

bookingSaleItems = [];
if (pm.environment.get("bookingSaleItems")) {
    bookingSaleItems = JSON.parse(pm.environment.get("bookingSaleItems"));
}

bookingComplements = [];
if (pm.environment.get("bookingComplements")) {
    bookingComplements = JSON.parse(pm.environment.get("bookingComplements"));
}

requestBody = {
    "idSale": pm.environment.get('saleId'),
    "user": pm.globals.get('pm-username'),
    "numCinema": pm.environment.get('cinemaId'),
    "barcode" : pm.environment.get('barcode'),
    "saleItems": bookingSaleItems,
    "complements": bookingComplements
};

// https://community.getpostman.com/t/set-array-from-environment-variable-for-request-body-in-postman/4743/2
pm.environment.set("body", JSON.stringify(requestBody));

2-Request-body.postman.json

{{body}}

2-Tests.postman.js

// Set this content in Request > "Tests" Tab
var jsonData = JSON.parse(responseBody);

if (pm.response.code == 200 && jsonData.data) {
    pm.environment.unset("body");
    pm.environment.unset("bookingComplements");
    pm.environment.unset("bookingSaleItems");
}