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Editorial Team
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Asked: 2026-05-25T20:55:45+00:00

I am trying to migrate an application from Rails 3 to 3.1 and having

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I am trying to migrate an application from Rails 3 to 3.1 and having problems with jQuery. The error is bellow. If I remove ‘javascript_include_tag “application”‘ all works fine (with no javascript), so something javascript-related is missing.

Showing C:/.../app/views/layouts/application.html.erb where line #7 raised:

couldn't find file 'jquery'
  (in C:/.../app/assets/javascripts/application.js:7)
 Extracted source (around line #7):

4:   <title><%= @title unless @title.blank? %></title>
5:   <!-- %= render 'layouts/stylesheets' % --> 
6:   <%= stylesheet_link_tag "application" %>
7:   <%= javascript_include_tag "application", :debug => true %>
8:   <%= csrf_meta_tags %>
9: </head>
10: <body>

In my Gemfile I have the entry for jquery-rails:

source 'http://rubygems.org'

gem 'rails', '3.1.0'
gem 'jquery-rails'
....

In application.js:

// This is a manifest file .......
//
//= require jquery
//= require jquery_ujs
//= require_tree .
//

As far as I know that it is the only requirement for working with jQuery in Rails 3.1.

What am I missing?

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1 Answer

  1. Editorial Team
    //= require jquery

    Is a new directive in Rails 3.1, which mentions the jquery.js file required.

    In Rails 3.1, the jquery.js and jquery_ujs.js files are located inside the vendor/assets/javascripts directory contained within the jquery-rails gem.

    Also, did you do a bundle install ?

    More about the asset pipeline at http://guides.rubyonrails.org/asset_pipeline.html.
    More about using Javascript in Rails at http://guides.rubyonrails.org/asset_pipeline.html#manifest-files-and-directives.

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