Ruby on Rails: How to debug xml API call?

Hi Friends, I am trying to create an XML API for my sample application.. I am seeing GET request is fine with status code 200 OK. In case of POST and PUT methods I am seeing the object is not created with given data. Meaning when I do POST request with input

Metonymy 10 4

the output is

19 2015-06-05T01:41:50Z
2015-06-05T01:41:50Z

If we see output the name, price and category are empty. I do not understand reason for this.

My Questions are

1) Why it is not taking all the data I gave?

2) What is the way to track payload inside controller

The headers are Accept: application/xml Content-Type: application/xml Thanks in advance..