Just wondering if we are able to re-write data that we was set via the setWriteString() method while responding to an inbound api call. For example, let's say the scripted rest resource code is as follows:
(function process(/*RESTAPIRequest*/ request, /*RESTAPIResponse*/ response) {
var body = request.body.data;
/* do something with request data
..
..
..
then start preparing the response
*/
var writer = response.getStreamWriter();
try
{
response.setContentType('application/json');
response.setStatus(200);
writer.writeString("{\"results\":[");
var inc = new GlideRecord('incident');
inc.query();
while(inc.next()){
var obj = {};
obj.id = inc.getValue('number');
obj.sys_id = inc.getUniqueValue();
writer.writeString(global.JSON.stringify(obj));
if (inc.hasNext()) {
writer.writeString(",");
}
}
writer.writeString("]}");
}
catch (ex)
{
// let's say exception was thrown on the 3rd iteration while gliding the incident table
// oh no...an exception..so we need to write something else to the stream
// is it possible to erase/remove everything that was added to the stream up until the exception occured?
// so that the response will contain details only about the error?
// something like below:
response.setContentType('application/json');
response.setStatus(500);
writer.writeString("{\"error\":\"Something went wrong\"}"); // this isn't working btw...the stream contained both the content generated in "try" block as well as the "catch" block
// this should not contain anything related to whatever was written from the earlier iterations....
}
})(request, response);
For the errors you can use the Scripted REST API Error objects.
Which should reset the output stream.
https://developer.servicenow.com/dev.do#!/learn/courses/paris/app_store_learnv2_rest_paris_rest_integrations/app_store_learnv2_rest_paris_scripted_rest_apis/app_store_learnv2_rest_paris_scripted_rest_api_error_objects
(function run(request, response) {
try {
...
} catch (e) {
var myError = new sn_ws_err.ServiceError();
myError.setStatus(500);
myError.setMessage('Something went wrong');
myError.setDetail('Error while retrieving your data: ' + e);
return myError;
}
})(request,response);
It might also be useful to get the error message from the GlideRecord
gr.getLastErrorMessage();
// something like aborted by businessrule or acl, etc...
For the details of your error message.