javascriptruby-on-railsruby-on-rails-3asset-pipelineerubis

Using a Rails helper method within a javascript asset

Is there any way to use a Rails helper method, more specifically, a path helper method within a javascript asset file. This file foo.js.coffee.erb

$('#bar').val("<%= create_post_path %>")

I would love it if I could get from erubis

$('#bar').val("path/to/create")
Solution

  • You can include any helper/module/class in an erb template with:

    <% environment.context_class.instance_eval { include MyHelper } %>

    See: https://github.com/rails/sprockets/blob/master/lib/sprockets/environment.rb and https://github.com/rails/sprockets/blob/master/lib/sprockets/context.rb

    To use the url helpers you have to include your specific applications' helpers.

    They are available at Rails.application.routes.url_helpers so: 

    <% environment.context_class.instance_eval { include Rails.application.routes.url_helpers } %>

    EDIT: Fixed links to moved sprockets repo but not really sure this still makes sense so many years later.