Rails无法从jQuery正确解码哈希数组

Question

In my view I save an array of hashes in a hidden field

    <div>
       <%= hidden_field_tag :data_filtered, :value => @data_filtered %>
    </div>

My javascript is

$(document).ready(function(){
    freezeTopRow($('#dataTable'));
    $("#export").click(function(){
        var data1 = $("#data_filtered").val()
        $.ajax({
            type: "POST",
            url: "export",
            dataType: 'json',
            data: {data_filtered: data1}
        });
    });
});

My controller is

  def export
    CSV.open("data.csv", "wb") do |csv|
       csv << params[:data_filtered].first.keys
       @data_filtered.each do |hash|
       csv << hash.values
      end
    end
  end

When I view params[:data_filtered] after it has been returned to the controller i see a string:

 "{:value=>[{"a"=>nil, "b"=>nil, "c"=>0}]}"

But I want it to be in its original form of (array of hashes, in this case just 1 hash) half the problem is the :value. I don't want that to be stored and I don't know how to parse that to get just the array. Basically i want

[{"a"=>nil, "b"=>nil, "c"=>0]

Answer 1

Try to send json data instead of string(that contains hash). If you send string via ajax then in controller you have to eval the params which has SEVERE SECURITY issue.

using eval : (PLEASE DONT USE IT)

eval('{:value=>[{"a"=>nil, "b"=>nil, "c"=>0}]}') will produce the original hash: {:value=>[{"a"=>nil, "b"=>nil, "c"=>0}]}