Populating RITM Variables from a REST Call - rest

Question

I'm in the process of learning scripted REST API's. I have one that creates a REQ and RITM when the user does a POST. I'm having trouble populating variables from the rest post to the RITM. Below is my current code. Response is the RITM, Requester, and short description. I'm open to all suggestions, like I said I'm learning this on the fly, so if there is any glaring problems, I'm all ears. Thanks!
(function process(/*RESTAPIRequest*/ request, /*RESTAPIResponse*/ response) {
var cartId = GlideGuid.generate(null);
var cart = new Cart(cartId);
var item = cart.addItem('25409830135aa20099fc7e776144b0a0');
var rc = cart.placeOrder();
var req = request.getHeader('ContactEmployeeId');
var sdesc = request.getHeader('ShortDescription');
//return rc.number;
//gs.addInfoMessage(rc.number);
var num = rc.sys_id; //get sys ID of newly created request
var rnum = 0;
//using the request number, query the RITM table for related RITM
var u = new GlideRecord('sc_req_item');
u.addEncodedQuery('request='+num);
u.query();
while ( u.next() )
{
rnum = u.number;
}
response.setBody({
Requested_Item: rnum,
u_requester: req,
short_description: sdesc
});
response.setContentType('application/json');
})(request, response);

Answer 1

You can use the setVariable(ritm, variableName, value) method such as this.
var cartId = GlideGuid.generate(null);
var cart = new Cart(cartId);
var item = cart.addItem('25409830135aa20099fc7e776144b0a0');
// add your variables here to the item variable in your cart object
cart.setVariable(item, "comments", message);
cart.setVariable(item, "my_var_1", value1);
cart.setVariable(item, "my_var_2", value2);
// submit order
var rc = cart.placeOrder();