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Generate dynamic class strings easily
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IHV Gem Version Build Status Build Status Build Status License Build Status Inline docs Security Maintainability Maintainability Technical Debt

A ruby implementation of Node's classnames package.


Add this line to your application's Gemfile:

gem 'class_name', github: 'invisiblehats/class_name'

And then execute:

$ bundle

Or install it yourself as:

$ gem install class_name


You can use this in any ruby environment. Test it out in your terminal:

require 'class_name'

include ClassName

class_name("ui card", { fluid: false, flexbox: true, float: false }, ["blue", "inverted"])
# "ui card flexbox blue inverted"


Add this line to ApplicationHelper:

module ApplicationHelper
  include ClassName

Then use it in your view templates:

<div class="<%= class_name('ui card', fluid: false, { blue: true }) %>"></div>

Would generate:

<div class="ui card blue"></div>


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the ClassName project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

Development team



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