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Development tools for Solidus extensions.
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This gem contains common development functionality for Solidus extensions.

If you're looking for runtime tools instead, look at solidus_support.


Add this gem as a development dependency of your extension:

spec.add_development_dependency 'solidus_dev_support'

And then execute:

$ bundle


Extension generator

This gem provides a generator for Solidus extensions. To use it, simply run:

$ solidus extension my_awesome_extension

This will generate the basic extension structure, already configured to use all the shiny helpers in solidus_dev_support.

Updating existing extensions

If you have an existing extension generated with solidus_dev_support and want to update it to use the latest standards from this gem, you can run the following in the extension's directory:

$ bundle exec solidus extension .

In case of conflicting files, you will be prompted for an action. You can overwrite the files with the new version, keep the current version or view the diff and only apply the adjustments that make sense to you.

Sandbox app

When developing an extension you will surely need to try it out within a Rails app with Solidus installed. Using solidus_dev_support your extension will have a bin/rails-sandbox executable that will operate on a sandbox app (creating it if necessary).

The path for the sandbox app is ./sandbox and bin/rails-sandbox will forward any Rails command to sandbox/bin/rails.


$ bin/rails-sandbox server
=> Booting Puma
=> Rails application starting in development
* Listening on tcp://
Use Ctrl-C to stop

Rebuilding the sandbox app

To rebuild the sandbox app just remove the ./sandbox folder or run bin/sandbox. You can control the DB adapter and Solidus version used with the sandbox by providing the DB and SOLIDUS_BRANCH env variables.

DB=[postgres|mysql|sqlite] SOLIDUS_BRANCH=<BRANCH-NAME> bin/sandbox

By default we use sqlite3 and the main branch.

Rails generators

Your extension will have a bin/rails-engine executable that you can use for generating models, migrations etc. It's the same as the default rails command in Rails engines.


$ bin/rails-engine generate migration AddStoreIdToProducts

The bin/rails shortcut

For convenience a bin/rails executable is also provided that will run everything but generators on the sandbox application. Generators will instead be processed in the context of the extension.

RSpec helpers

This gem provides some useful helpers for RSpec to setup an extension's test environment easily.

Add this to your extension's spec/spec_helper.rb:

require 'solidus_dev_support/rspec/feature_helper'

This helper loads configuration needed to run extension feature specs correctly, setting up Capybara and configuring a Rails test application to precompile assets before the first feature spec.

feature_helper builds on top of rails_helper, which you can also use a standalone helper if you want:

require 'solidus_dev_support/rspec/rails_helper'

This will include the Rails and Solidus-related RSpec configuration, such as authorization helpers, Solidus factories, URL helpers, and other helpers to easily work with Solidus.

rails_helper, in turn, builds on top of spec_helper, which is responsible for setting up a basic RSpec environment:

require 'solidus_dev_support/rspec/spec_helper'

Code coverage

The gem also includes a SimpleCov configuration that will send your test coverage information directly to Simply add this at the top of your spec/spec_helper.rb:

require 'solidus_dev_support/rspec/coverage'

Note: Make sure to add this at the VERY TOP of your spec_helper, otherwise you'll get skewed coverage reports!

If your extension is in a public repo and being tested on Travis or CircleCI, there's nothing else you need to do! If your setup is more complex, look at the SimpleCov and codecov-ruby docs.

RuboCop configuration

solidus_dev_support includes a default RuboCop configuration for Solidus extensions. Currently, this is based on Relaxed Ruby Style with a few customizations, but in the future we plan to provide custom cops to ensure your extension follows established Solidus best practices.

We strongly recommend including the RuboCop configuration in your extension. All you have to do is add this to your .rubocop.yml:

  - solidus_dev_support/rubocop

You can now run RuboCop with:

$ bundle exec rubocop

Changelog generator

Generating a changelog for your extension is possible by running this command:

$ CHANGELOG_GITHUB_TOKEN="«your-40-digit-github-token»" bundle exec github_changelog_generator github_username/github_project

This generates a, with pretty Markdown formatting.

For further instructions please read the GitHub Changelog Generator documentation.

Release management

By installing solidus_dev_support, you also get gem release, which you can use to automatically manage releases for your gem.

For instance, you can run the following to release a new minor version:

$ gem bump -v minor -r

The above command will:

  • bump the gem version to the next minor (you can also use patch, major or a specific version number);
  • commit the change and push it to origin/main;
  • create a Git tag;
  • push the tag to the origin remote;
  • release the new version on RubyGems.

You can refer to gem release's documentation for further configuration and usage instructions.

Rake tasks

To install extension-related Rake tasks, add this to your Rakefile:

require 'solidus_dev_support/rake_tasks'

task default: 'extension:specs'

(If your extension used the legacy extension Rakefile, then you should completely replace its contents with the block above.)

This will provide the following tasks:

  • extension:test_app, which generates a dummy app for your extension
  • extension:specs (default), which runs the specs for your extension

If your extension requires the test_app to be always recreated you can do so by running:

bin/rake extension:test_app extension:specs


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 bin/rake install.

Releasing new versions

Please use the same process suggested for extensions in the dedicated page in the Solidus wiki.


Bug reports and pull requests are welcome on GitHub at


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