Javascript Runtime for Rails 3.1

[Rodney Degracia]

Just curious, but does someone know the inside story as to why Rails 3.1 needs a Javascript runtime ?

Rodney Degracia
rdeg...@gmail.com

http://www.elitefrontier.org

[Jacob Swanner]

Rodney,

Rails 3.1 does not *need* a JavaScript runtime, but one is included by default: it's used for the asset pipeline, since it supports compiling CoffeeScript into JavaScript.

If this is not something that you want, you can remove the "gem 'coffee-script'" line from your Gemfile.

- Jacob

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[Jason Seifer]

This is unpossible, see reference at http://doihavetousecoffeescriptinrails.com/ 

[Rodney Degracia]

Jacob,

The reason why I was asking, is because I did something like:

rvm gemset create rails31
rvm gemset use rails31
gem install rake
gem install rails -v 3.1.0
rails new testapp
cd testapp
bundle install
rails server

and then I got the error message, "Could not find a JavaScript runtime. See
https://github.com/sstephenson/execjs for a list of available runtimes."

Since the installation was a default installation, the error message
suggests that Rails 3.1.0 needs a Javascript runtime. I was just wondering
if anyone knew the backstory as to why that appears to be the case.

Rodney

[Jacob Swanner]

Rodney,

I guess I should correct my previous statement a bit: it does not include a JavaScript runtime, but does include execjs (through the coffee-script gem) which can use a number of different JavaScript runtimes.  If you look at the README of execjs you will see the list of runtimes that it works with.

All I was trying to say before was that Rails 3.1 does not actually require a JavaScript runtime; but, the default Gemfile it creates includes the coffee-script gem, which does require a JavaScript runtime.  Rails 3.1 will run just fine without one.

The ability to write your front-end scripts in CoffeeScript is worth installing one of the supported runtime, IMHO.

- Jacob

[Marshall Sontag]

I heard Rails can't scale either. Can anyone confirm or deny?

[Matt Aimonetti]

Confirm

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