在通过Ajax调用将JavaScript哈希发送到Rails操作方面需要帮助

Question

This is my JS function,

function checkHash() {

var myHash = {"apples": 3, "oranges": 4, "bananas": 42}

var url = '../../some_contoller/some_action'
var pars = 'myHash=' + encodeURIComponent(myHash)


var myAjax = new Ajax.Request(
  url,
    {
      method: 'get',
      asynchronous: asyncFlag,
      parameters: pars,
      onSuccess: function(transport) {

        //alert(transport.responseText);
        try {
          tax_hash = eval('('+transport.responseText+')');
          //alert("tax_hash = " + tax_hash)
        }
        catch(err){
          return

        }    
     onFailure: function() {
     }

} }
)
}

Rails action,

def some_action

p params    ##It will print {"myHash"=>"[object Object]"}

end

I want to print {"apples": 3, "oranges": 4, "bananas": 42}

Answer 1

First off, it's not a good idea to use eval on the results of your AJAX request. It's much better to have the request be interpreted as JSON (if that's all you're using it for).

Here is info on how to tell rails to return JSON: http://guides.rubyonrails.org/layouts_and_rendering.html#rendering-json

Also I would recommend only returning the params you're interested in and not all of them:

def some_action
    render json: params.reject {|k,v| ![:action,:controller, :other_params].include?(k)}
end