Ruby experiments installation

Install the gem

Required

Add the PostHog Ruby gem to your Gemfile:

Gemfile

gem "posthog-ruby"

Configure PostHog

Required

Initialize the PostHog client with your API key and host:

Ruby
posthog = PostHog::Client.new({
    api_key: "<ph_project_api_key>",
    host: "https://us.i.posthog.com",
    on_error: Proc.new { |status, msg| print msg }
})

Implement your experiment

Required

Experiments run on top of our feature flags. You can define which version of your code runs based on the return value of the feature flag:

Note: Server-side experiment metrics require you to manually send the feature flag information. See this tutorial for more information.

experimentFlagValue = posthog.get_feature_flag('your-experiment-feature-flag', 'user distinct id')

if experimentFlagValue == 'test'
    # Do something differently for this user
else
    # It's a good idea to let control variant always be the default behaviour,
    # so if something goes wrong with flag evaluation, you don't break your app.
end

4
Run your experiment
Required
Once you've implemented the feature flag in your code, you'll enable it for a target audience by creating a new experiment in the PostHog dashboard.

Next steps

Recommended

Resource	Description
Creating an experiment	How to create an experiment in PostHog
Adding experiment code	How to implement experiments for all platforms
Statistical significance	Understanding when results are meaningful
Experiment insights	How to analyze your experiment data
More tutorials	Other real-world examples and use cases

Ruby experiments installation

Install the gem

Configure PostHog

Implement your experiment

Run your experiment

Next steps

Community questions

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