Policy example

policy_example.rb

module FeaturePolicy
  extend ActiveSupport::Concern

  class_methods do
    def policy_access_klass(klass)
      self.policy_access_klass = klass
    end

    included do
      class_attribute :policy_access_klass,
                      instance_accessor: false,
                      instance_predicate: false,
                      default: ApplicationPolicy

      pre_check :access?
    end
  end

  def access?
    raise NotImplementedError, "FeaturePolicy#access? must be implemented in #{self.policy_feature_klass}"
  end
end

class ApplicationPolicy
  include FeaturePolicy
end

class Audit::ApplicationPolicy < ApplicationPolicy
  policy_access_klass self

  def access?
    # Should we have a new OrganizationFeature model? checks could be backed by a standard feature flag format
    OrganizationSetting.enabled?(:audit)
  end
end

class Audit::ResultPolicy < Audit::ApplicationPolicy
  def show
    # ...
  end
end

class Discuss::ApplicationPolicy < ApplicationPolicy
  policy_access_klass self

  def access?
    # Should we have a new OrganizationFeature model? checks could be backed by a standard feature flag format
    OrganizationSetting.enabled?(:discuss)
  end
end

class Discuss::GroupPolicy < Discuss::ApplicationPolicy
  def show
    # ...
  end
end

class Discuss::MessagePolicy < Discuss::ApplicationPolicy
  def show
    # ...
  end
end