Why is jQuery not loading in my Rails 3.2.3 app?

Question

Up until yesterday jQuery was loading just fine in my Rails app. I was playing around with getting the debugger/ruby-debug gem installed. As you are probably aware there are issues with the debugger gem in Rails 3 and I was unsuccessful in getting the dependancies installe so I removed the gems from my Gemfile. Since then when loading my site jQuery is not loading. These are the messages I see in console: ``` assets/jquery_ujs.js?body=1:377Uncaught ReferenceError: jQuery is not defined bootstrap-transition.js:24Uncaught TypeError: undefined is not a function bootstrap.js:3Uncaught ReferenceError: jQuery is not defined welcome:210Uncaught ReferenceError: $ is not defined ``` And here is my application.js file: ``` //= require jquery //= require jquery_ujs //= require twitter/bootstrap //= require_tree . ``` If I load jQuery explicitly in layouts/application.html.erb, like so, it works: ``` <%= javascript_include_tag "http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" %> <…

Accepted Answer

Thanks @Djj. Re-ordering my application.js tree seems to have resolved the issue. Here is my revised tree:

```
//= require jquery_ujs
//= require jquery
//= require twitter/bootstrap
//= require jquery.placeholder
//= require_tree .
```

Why is jQuery not loading in my Rails 3.2.3 app?

Solution

Problem