reg.js.coffee

$('#new_user').submit (e) ->
  e.preventDefault()
  data = $(e.target).serializeArray()
  $.ajax
    type: "POST"
    data: data
    dataType: "json"
    url: $(e.target).attr('action')
    success: (res) ->
      window.location += ""
    statusCode:
      422: (res) -> 
        errors = JSON.parse(res.responseText)
        _.each(errors, (value, key)->
          console.log key 
          console.log value[0]
        )