Errors when trying NetSuite's Restlet interface: datain is null - netsuite

Question

I'm trying out Restlets for the first time and I am having trouble returning any data.
I've built a basic restlet and deployed it in NetSuite. The code is as follows:
function getRESTlet(dataIn) {
return nlapiLoadRecord(dataIn.recordtype, dataIn.id); // e.g recordtype="customer", id="769"
}
Using Chromes' REST Console application I've set up the following:
Request URI: https://rest.netsuite.com/app/site/hosting/restlet.nl?script=123&deploy=1&recordtype=customer&id=2409
Request Headers: NLAuth nlauth_account=123456,nlauth_email=email#emailaddy.com,nlauth_signature=password
Running it as a GET operation I return the following error:
error code: JS_EXCEPTION
error message:type
Followed by the following email:
Date & Time: 8/19/2013 2:48 pm
Execution Time: 0.06s
Script Usage: 0
Script: getRecord
Type: RESTlet
Function: getRESTlet
Error: SSS_MISSING_REQD_ARGUMENT
type
Stack Trace: getRESTlet(getCustomer.js:14)
restletwrapper(null$lib:3)
The customer record exists, the RestLet code is from the NetSuite help system, and I get an error email when the script fails so I know the deployment URL is good.
Any ideas on what I'm doing wrong?
--EDIT--
Changing my function signature to function getRESTlet(type,dataIn) resolves the type error, although now I get:
error code: UNEXPECTED_ERROR
error message:TypeError: Cannot read property "recordtype" from undefined (getCustomer.js#14)
I've also removed customer and id from the request URI and instead listed them in the Request Payload section of REST Console.
--Edit 2--
adding nlapiLogExecution('DEBUG', 'JSON.stringify(datain) is:', JSON.stringify(datain)); to the function is returning blank for the log entry. It appears that datain is null....

Answer 1

I had a similar issue that was resolved once I set the request header content-type to application/json.
The default content-type is text/plain which passes a stringified JSON object to the function and expects a string to be returned.
If you set the content-type to application/json or application/xml the 'datain' parameter will come in as a javascript object.
From the NetSuite Docs:
If users specify a content type other than JSON or TEXT, a 415 error
is returned with the following message:
Invalid content type. You can
only use application/json, application/xml or text/plain with
RESTlets.
If users provide data in a format different from specified
type, the following error is returned with one of the following
messages:
Error code = INVALID_RETURN_DATA_FORMAT Error message =
Invalid data format. You should return TEXT. Error message = Invalid
data format. You should return a JavaScript object.

Answer 2

To fix the error of
Error code = INVALID_RETURN_DATA_FORMAT Error message =
Invalid data format. You should return TEXT. Error message = Invalid
data format. You should return a JavaScript object.
You can supply a Content-type to the get specified get request of 'json'. Documentation would seem to indicate that you should specify "accepts" json, but for me only the content-type on a get made the request work.

Answer 3

I got this error: SSS_MISSING_REQD_ARGUMENT when trying to submit a transform record type that I had specified in camel case rather that all lower case... took me a day to work that out :(

Answer 4

changing the function to:
function getRESTlet(datain) {
return nlapiLoadRecord(datain.recordtype, datain.id); // e.g recordtype="customer", id="769"
}
resolves the issue. I thought I had tried without camelCase, but alas I did not.
So moral of the story is: datain is case sensitive!