Retrieving Array of Object from params on Grails

Question

I'm passing an Array on a POST request using an AJAX call, but not a simple one, rather an Array of Objects:

var param = {
    ...,
    branches: {
        0: {
            address: "...",
            telephone: "...",
            fax: "...",
            ...
        },
        ...
        nth: {
            address: "...",
            telephone: "...",
            fax: "...",
            ...
        }
    }
}

$.ajax({
    type: "POST",
    url: ".../saveTransaction"
    data: param
    success: function(r) {
        ...
    }
});

This is my controller

def orderService;
function saveTransaction() {
    def response = orderService.save(params)
    render response as JSON
}

And this is my service:

def save(params) {
    def branches = params.branches
    println "branches: $branches"

    def branches = params.list("branches")
    println "branches: $branches"

    branches = params.list("branches[]")
    println "branches: $branches"
}

It does not display what I expect, instead it displays the following:

branches: null
branches:
branches: []

How can I get these passed branches on the service from the params as an Array / List?

After experimenting, I've seen that it is not passed as an object rather as a flat Map having it's accessor as the key, so when I use:

println "branches: " + branches."[0][address]"

It prints:

branches: ...

Now, my follow-up question is how can I change this behavior to this instead?

println "branches: " + branches[0].address

Can you paste here the params that your getting in controller — Anant Kolvankar
– Anant Kolvankar, Commented Jun 13, 2015 at 9:23

injecteer · Accepted Answer · 2015-06-13 13:07:38Z

2

you might want to use JSON format for your request, which is more appropriate for your data structure:

$.ajax({
    type: "POST",
    url: ".../saveTransaction",
    dataType:'json',
    data: param     
});


class YourController {
  def save(){
    def json = request.JSON
    def list = json.branches
    service.save list
  }
}

answered Jun 13, 2015 at 13:07

injecteer

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3 Comments

Gideon Over a year ago

Sorry for a late reply. This doesn't work, just tested this today, println "JSON: $json" displays: JSON: [:].

injecteer Over a year ago

you request must be empty

Gideon Over a year ago

How can you pass value to request? Isn't it just the same with params that is automatically generated when a request was made to the controller?

Community · Accepted Answer · 2017-05-23 12:01:02Z

1

Based on Igor's anser, I changed my AJAX call, used the JSON.stringify function and contentType option:

$.ajax({
    type: "POST",
    url: saveAgreementURL,
    data: JSON.stringify(data),
    contentType: 'application/json',
    success: function(r) {
    }
});

And on my controller, I used this:

def orderService;
function saveTransaction() {
    def response = orderService.save(request.JSON)
    render response as JSON
}

edited May 23, 2017 at 12:01

CommunityBot

11 silver badge

answered Jun 29, 2015 at 3:21

Gideon

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