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Is it possible to comment out this line in the new app/assets/application.js file? If so, how?
//=require jquery_ujs
I mean, it's already commented out to avoid being misconstrued as CoffeeScript or JavaScript, but it's obviously serving a purpose still.
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To compile your assets locally, run the assets:precompile task locally on your app. Make sure to use the production environment so that the production version of your assets are generated. A public/assets directory will be created. Inside this directory you'll find a manifest.
RAILS_ENV=production tells Rails to compile the production version of the assets. assets:precompile is a Rails provided rake task that has instructions for compiling the assets.
A manifest typically includes special comments, called directives, to add JavaScript files to a bundle. The contents of a typical Rails manifest looks something like this: your_app/app/assets/javascripts/application.
Taken from the Sprockets 1.02 github (Sprockets 2 is what rails 3.1 uses to accomplish asset loading):
How Sprockets handles comments
Use single-line (//) comments in JavaScript source files for comments that don't need to appear in the resulting concatenated output.Use multiple-line (/* ... */) comments for comments that should appear in the resulting concatenated output, like copyright notices or descriptive headers. PDoc (/** ... **/) documentation comments will not be included in the resulting concatenation.
Comments beginning with //= are treated by Sprockets as directives. Sprockets currently understands two directives, require and provide.
What this means is that //= jquery_ujs is a directive. It instructs Sprockets to include the jquery_uls file when it compiles all the jquery files.
If you don't want that file included, just remove the equals sign and the directive becomes a comment.
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Short and fast ...
//require jquery_ujs
... just remove the = sign.
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