app.coffee

$(".resend_auth").live "click", (e) ->
    e.preventDefault()
    link = $(this)
    $.ajax
       url: link.attr("href")
       dataType: "json"
       success: (json) ->
          alert(json.msg) 

app.js

$(".resend_auth").live("click", function(e){
    e.preventDefault();
    var link = $(this);
    $.ajax({
       url: link.attr("href"),
       dataType: "json",
       success: function(json) {
          alert(json.msg) 
       }
    });
})