Determinator Context

This is a gem to manage Determinator context objects.

It allows you to define the actors that will be determinated upon in a single place in the controller, where they can be tested; then, the ID to be determinated upon are decided either by pointing to an attribute in code, or with a structured setting in the feature itself.

Installation

Add this line to your application's Gemfile:

source "https://8Sshw-M7Dp0iGmkGphMxS4s7BCCuI@gem.fury.io/deliveroo/" do
  gem 'determinator-context'
end

And then execute:

$ bundle

Usage

The simplest way to set up a context is to use the included helper in your controllers. For example:

class ApplicationController < ActionController::Base
  include Determinator::Context::Helpers

  determinator_actor(:request) do
    Determinator::Models::Request.new(
      uid: 'abc', customer: {guid: 'foo', sticky_guid: 'bar', session_guid: nil}
    )
  end

  determinator_actor(:customer) do
    next nil unless current_user.present?

    Determinator::Models::Customer.new(
      id: current_user.id,
      email: current_user.email,
      employee: current_user.employee
    )
  end
end

class MenuController < ApplicationController
  include Determinator::Context::Helpers

  determinator_actor(:restaurant) do
    # If 'to_determinator' is a method on the model
    # which returns the constructed object
    restaurant.to_determinator
  end

end

Then, if the feature has a structured_bucket set, you can just use the determinator context to determinate:

determinator_context.which_variant('test_feature')

If the feature is not structured, or for some reason you want to override the structured bucket, you can do:

determinator_context.using('request.customer.guid').which_variant('test_feature')

Development

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 GemFury.