Request params and PUT method

Question

I'm trying to get request params passed by PUT request, at Grails-based app.

I'm using following client code to make request:

$.ajax({
    url: 'api/controllerName/anId',
    type: 'PUT',
    data: $('form').serialize()
})

with following mapping:

"/api/$controller/$id?" {
    action = [ GET: "read", POST: "create", PUT: "update", DELETE: "delete"]
}

But my controller's action receives empty params list, with only id value. I tried to put it content to logs and saw only:

[id:anId, action:[GET:read, POST:create, PUT:update, DELETE:delete], controller:controllerName]

and request.getParameterNames() returns empty list of values.

As I see from FireBug, request contains this params, and have Content-Type as application/x-www-form-urlencoded; charset=UTF-8

If I'm using GET/POST method - everything is working as expected, I can get all passed parameters.

How I can get access to passed parameters?

Update: I've just figured that PUT implies passing data as JSON/XML in body. Btw, this question is still actual, just in case

Answer 1

I had the exact same issue today and was able to fix it. I did an ajax request with JQuery to a Grails RESTful WebService (method: "PUT"), but the parameter map was empty.

Just want to share my solution here.

I had to JSON.stringify my data and set the contentType to "application/json" and then use request.JSON (as suggested before) in my Grails controller.

example (JQuery Ajax Request):

$.ajax({
        url: "/entries/" + id,
        contentType: "application/json",
        type: "PUT",
        dataType: "json",
        data: JSON.stringify({'name' : name, 'date': date}),
        success: function(msg) {
            console.log('updated...')
            $.mobile.changePage($('#list'));
        }

afterwards I could use:

request.JSON

in my Controller in order to get the data sent by the ajax request (params was still empty). If I did not use JSON.stringify and set the content type, I had the following Grails error:

Error 2012-04-03 13:50:20,046 [http-bio-8080-exec-3] ERROR errors.GrailsExceptionResolver  - IllegalStateException occurred when processing request: [PUT] /entries/2
getReader() has already been called for this request. Stacktrace follows:
Message: getReader() has already been called for this request

I'm using Grails 2.0.1 and JQuery 1.7.1

Answer 2

Try request.JSON (or request.XML) instead of params.