CODEWITHSUNDEEP
ruby-on-rails-3sprockets
katzmopolitan
katzmopolitan

Reputation: 1381

Environment specific variables in sprockets

I'm use Rails 3.2 built in sprockets functionality to compile static assets. Is it possible to compile javascript with environment specific variables?

So I would like to do something like this

/assets/javascripts/myfile.js

 //lots of code
 script.src =
        ('https:' == document.location.protocol ? 'https://' : 'http://') +
                'some.metrics.site/projects/<%=ENV_SPECIFIC_TOKEN%>.js';
  //lots of other code

Upvotes: 2

Views: 1211

Answers (2)

Mahdi
Mahdi

Reputation: 75

Any update for this issue?

Using the .erb extension solves the problem but not when you precompile assets.

In my case, I need to precompile the assets for my staging environment. When I do rake assets:precompile RAILS_ENV=staging, I can see in the js assets generated that my environment variable is not defined and thus the string interpolation results in an empty string.

The problem is (I think) that the environment variable definition is in config/application.rb, which is not called while generating assets.

I think that the gem Capistrano may help by adding some tasks before generating the assets, but if we can define some environment variables while generating the assets (in the CLI for example), it would be better.

Upvotes: 0

Ross Allen
Ross Allen

Reputation: 44880

Sprockets lets you append any number of preprocessors to a filename. Add a .erb to the end, and it will be first interpreted as ERB and then output as a JavaScript file.

mv assets/javascripts/myfile.js assets/javascripts/myfile.js.erb

Check out the Rails Asset Pipeline guide on JavaScript/CoffeeScript and ERB.

Upvotes: 1

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