Inspired by coffeebeans but with fixes:

1. Doesn't compile coffeescript everytime in production
2. Smart replacements for <%=%>

Use #to_json in safe mode

<%=  x %> # replaced with `<%== (x).to_json %>`

Use raw mode in raw mode

<%== x %> # replaced with `<%== x %>`

In your Gemfile:

gem "coffee-views"

This library depends on the coffee-script gem

# in create.js.coffee
$("#item").html <%= render "user/card" %>

Note: There is no need to call j or escape_javascipt helpers.

Coffee Script string interpolation like syntax (#{=} for safe and #{==} for raw):

# in update.js.coffee
alert "hello #{= @user.name}"

You can use coffeeview: embedded engine in slim

h1 Say Hi
coffeeview:
  alert <%= @some_view_string %>