rails 4.1.6 form_for coffeescript on multiple views not working

I can get the coffeescript to work with one view (/users/new.html.erb):

<h1> Sign up! </h1>
<%= form_for (@user) do |f| %>
  <%= f.label :email %><p class="error email-error"></p>
  <%= f.email_field :email %>       

  <%= f.submit "Sign Up", class: 'btn' %>   
<% end %>

and one coffeescript file (/users.js.coffee):

ready = ->
  $('form').submit ->

  $('.error').text ''    
  email = $('#user_email').val()

  if email == ''
    $('.email-error').text 'Please enter your email.'

  false
return

$(document).ready(ready)
$(document).on('page:load', ready)

BUT not when I try to add a second view (/sessions/new.html.erb):

<h1> Log In </h1>
<%= form_for(:session, url: login_path) do |f| %>
  <%= f.label :email %><p class="error email-error"></p>
  <%= f.email_field :email, :id => "session_email" %>

  <%= f.submit "Log In", class: 'btn' %>    
<% end %>

and coffeescript file (/sessions/js.coffee):

main = ->

  $('form').submit ->

  $('.error').text ''    
  email = $('#session_email').val()

  if email == ''
    $('.email-error').text 'Please enter your email'

  false
return

$(document).ready(main)
$(document).on('page:load', main)

I know that ultimately the coffeescript is compiled into one file by rails so it will not know which 'form' I am referencing. But when I've tried to add id tags to the forms, I can't even get one form to work. I've been stuck for 2 days on this and can't figure it out. Any help would be greatly appreciated. Thanks!