How to get json structure in Rails?

Question

my application should sent structure via json, that functions works fine:

function send_json()
{
    var formData = form2object('myForm');
    var json_data = JSON.stringify(formData, null, '\t');
    $.post("", json_data);
}

It create json_data and send it via post. But I don't understand how to catch this data on another side, can you help me ? I should take this structure and make some actions with it.

when i send data i got json:

{ "type": "test", "ttl": "1", "amount": "1", "rules": { "rule1": "1", "value1": "4444", "stackcount1": "1", "rule2": "2", "value2": "333", "stackcount2": "2" }}

In the contoller i wrote this:

class AdminController < ApplicationController
  def index
    @json_string = params[:amount]
    if !@json_sting.nil?
      @json_string = JSON.parse(params[:amount])
    end
  end
end

in the view(haml) i wrote:

=@json_string

It doesn't work !

But wireshark shows:

POST /admin/ HTTP/1.1
Host: localhost:3000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20100101 Firefox/14.0.1
Accept: */*
Accept-Language: ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Referer: http://localhost:3000/admin/
Content-Length: 192
Cookie: _GiftSenderTool_session=BAh7BzoQX2NzcmZfdG9rZW4iMTVyNVJCMTBvcGpKSk5OcFN4bW15YVlpRlF1TUNtb1gwZkY0bTRuRHlsNnM9Ig9zZXNzaW9uX2lkIiU4ZjFjNTNjNTY0MTQ1MGExNmFiODcxZGEyYzU5ZTkxMg%3D%3D--f21bf3b96edc3bc551c8de68acc6da17685d58b4
Pragma: no-cache
Cache-Control: no-cache

{
."type": "test",
."ttl": "1",
."amount": "1",
."rules": {
.."rule1": "1",
.."value1": "4444",
.."stackcount1": "1"
.},
."authenticity_token": "n3B6D/Km9zOgOzlosK/OLHyTCDLk3MyCTlTBinfQcnY="
}

It means that i can't get data.

You probably want to use respond_to with format.json. Read this ASCIICast about controllers. — mrzasa
– mrzasa, Commented Aug 10, 2012 at 14:24
@mrzasa, sounds like he wants to read json in his Rails app, not output it. — Mischa
– Mischa, Commented Aug 10, 2012 at 14:27
I made variable in json format and i sent this json to the same page(doesn't matter, i could sent it to another page). How should I take this json in page ? Some actions, actions which i can do with data, everything. I can put it to database or put to view. Of course I wrote about rails, i set tags. — alterpub
– alterpub, Commented Aug 10, 2012 at 14:33

Ch4rAss · Accepted Answer · 2012-08-10 14:32:46Z

1

you have to catch your JSON object in some rails controller action. If your JSON string looks like this:

{ "user": { "id": 1, "name": "Tom" } }

then do it like this:

require "json"
...
def some_action
  user = JSON.parse(params[:user])
  puts "User id is #{user[:id]}"
  ...
end

answered Aug 10, 2012 at 14:32

Ch4rAss

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