Active interaction controller

activities_controller.rb

module Api
  module V1
    class ActivitiesController < Api::V1::ApplicationController
      render_interactions :create, :update, :show, :destroy
    end
  end
end

application_controller.rb

module Api
  module V1
    class ApplicationController < ::ApplicationController
      class << self
        private

        def render_interactions(*actions)
          actions.each do |action|
            define_method(action) do
              render_interaction(
                "#{self.class.name.sub(/Controller$/, '')}::#{action.to_s.titleize}Interaction".constantize
              )
            end
          end
        end
      end

      private

      def render_interaction(
        klass,
        success: ->(int) { render json: int.result },
        failure: ->(int) { render json: int.serialized_errors, location: false, status: :unprocessable_entity }
      )
        interaction = klass.run(interaction_params)

        (interaction.valid? ? success : failure)[interaction]
      end

      def interaction_params
        params
          .permit!
          .to_h
          .deep_transform_keys(&:underscore)
          .merge(current_user: current_user)
      end
    end
  end
end