cakephp and ajax

Hi, I am relatively new to Cake, I took over a web site that uses it and am still learning the ropes, but slowly getting there.

One issue has do have is with the image shown below.

I want to be able to retrieve data from the DB when clicking on the Apply link.

I have create a model and controller and have added this code to the click event for the link.

$('#go').click(function(){
$.ajax({
url:'/discount/index',
type:'POST',
data:data
});

What I'm unsure about is how to retrieve the the data from the DB and how to put it into the input box - table is called settings and field is discount_code.

Any help would be greatly appreciated

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