Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

Soul Medicine

Build Status

Currently in active development

If you'd like to help Chayn by tackling any of our open Github issues, please get in touch with us to express your interest in volunteering via this form. We'll get back to you to schedule an onboarding call.



  • Ruby - see .ruby-version for the version required
  • NodeJS 10+
    • with Yarn 1.10+
  • Docker Compose v1.23+
  • erb_lint gem gem install erb_lint -v 0.1.3 - you need a specific version as version of Ruby is old
  • bundler gem gem install bundler:1.17.3 - you need a specific version as version of Ruby is old
  • shared-mime-info a dependency of mimemagic brew install shared-mime-info

Dependent services

Docker Compose is the recommended way to run all dependent services locally, like the PostgreSQL db and Redis instances. Environment variables in .env have been set up to communicate with these services.

After installing Docker Compose (e.g. using Docker for Mac) you can…

Start all services in the background:

docker-compose up -d

Shut down all these services:

docker-compose down

Initial Setup

Once you have the prerequisites above, the codebase cloned and the dependent services running locally…

Set up local env vars in a new .env.local file – see the section at the bottom of the .env file for the variables you may need to set.

You will need to ensure your local database has the role "sm" set up with permissions to create databases.

Then run the following to set everything up:


Running the app locally

Start up the Rails server with:

bin/rails server

This serves the app, including all frontend assets (bundled using Webpack).

You can also run bin/webpack-dev-server in a separate terminal shell if you want live reloading (in your browser) of CSS and JavaScript changes (note: only changes made within the app/webpack folder will cause live reloads).

(optionally) Start up the background processor with:

bundle exec sidekiq -c 1

Running tests

bundle exec rspec

When you run the full test suite with the above command a report will be generated by SimpleCov. In the command line on completion of the tests you will see a coverage %.

If you want more indepth understanding of which files are covered:

open coverage/index.html

Dev tips

  • To get Rubocop to fix detected issues automatically (where it can):

    • bundle exec rubocop -a
  • To run Brakeman locally

    • brakeman
  • To step through the ignored warnings

    • brakeman -I

Testing subscription emails

Local dev

Email templates

When working on email templates, Action Mailer Previews provide a way to test the output of these templates without having to actually send any emails. We have one set up for subscription lesson emails – example usage:


Note: this preview currently uses the first User in the database, so make sure you have one registered locally!

Full subscription email flow

You can also test out the full subscription email flow locally. We use mailcatcher to capture all sent email from the local app. An instance of mailcatcher will already be running if you've used the Docker Compose set up mentioned above – you can open this at http://localhost:1080/.

Steps to test:

  1. Start up the Sidekiq background worker using:
  • bundle exec sidekiq -c 1
  1. Make or edit a new subscription in the app – make sure the schedule is set accordingly (i.e. to send you an email within the current time slot; note the timezone option, especially if you're currently in daylight savings time).
  2. Trigger the subscriptions processor:
  • bin/rails subscriptions:trigger_worker
  1. Watch the logs for the Sidekiq background worker to see it processing subscriptions and potentially sending out lesson emails.
  2. Open up the mailcatcher interface to view all sent emails:

On Heroku review apps

By default, newly created review apps on Heroku won't have any of the subscriptions processing and email sending set up. If you do need to test out subscriptions on a review app you can set this up:

  • A Mailgun email service add-on should already be provisioned within the review app – you now need to add your email address to the "allow list" to ensure emails are received:
    • Go to the "Resources" section of your review app in the Heroku console
    • Click on the "Mailgun" add-on – this opens up the Mailgun console
    • Click on "Overview" in the left hand sidebar
    • In the "Authorized Recipients" section of the page, add your email address
    • A confirmation email will be sent to you with an activation link that you'll need to click on
  • Now enable a worker dyno for the Sidekiq background worker:
    • Go to the "Resources" section of your review app in the Heroku console
    • Enable a single worker dyno under the "Hobby Dynos" section
  • Now set up a recurring job to trigger the subscriptions processing:
    • Go to the "Resources" section of your review app in the Heroku console
    • Under "Add-ons" search for "scheduler" and select "Heroku Scheduler", then click on "Provision"
    • Now click on the new "Heroku Scheduler" entry in the list to open it's console
    • Click on "Create job"
      • Schedule for "Every hour at..." ":00" (or a different time point if needed for testing)
      • Set the run command to: bin/rails subscriptions:trigger_worker
      • Then click on "Save job"
    • This will run the subscriptions processor on an hourly basis
  • Now you're ready to create subscriptions in that review app instance and receive lesson emails from it

Storyblok content preview mode and caching

The env var CONTENT_PREVIEW_MODE determines the behaviour of content fetches from Storyblok…

When CONTENT_PREVIEW_MODE is set to true:

  • draft versions of content are fetched
  • content is not cached
  • --> this is useful for review apps and preview environments, for testing the very latest content

When CONTENT_PREVIEW_MODE is set to false:

  • only the last published versions of content are fetched
  • content is cached in the Redis specified by the env var REDIS_CACHE_URL
  • --> so subsequent requests for this data don't need to fetch from Storyblok
  • --> this is important for staging and production environments
  • --> this means any published content updates may take some time to show up live (details below)

The cached content, by default, expires after an hour, after which new published content will be fetched from Storyblok. This expiry can be controlled by the CONTENT_CACHE_TTL_MINS env var, if required.

To flush the cache manually, open up the endpoint <site_base_url>/admin/flush_cache in a browser. Now the very latest published content will be fetched from Storyblok.

Support Us

Soul Medicine is created by Chayn a global volunteer network with over 400 volunteers from 15 countries. If you like what you see and you want to join our team of volunteers get in touch. Or you can donate; all proceeds go to improving Soul Medicine and building more tools and resources at ChaynHQ.


Soul Medicine a multilingual digital service designed to deliver critical information in bite-sized pieces.







No releases published


No packages published