I want to introduce the committee with Rails without getting too dirty

Overview

--I want to introduce Request and Response Validation in the committee to add API for public release to Rails project. --If you put it as middleware of Rack, it will affect the existing processing.

manner

Add committee to Gemfile and bundle install.

gem 'committee'

All you have to do now is create a class to use the committee and call it from the Controller.

lib/public_api/committee_validator.rb

module PublicApi
  class CommitteeValidator
    attr_reader :request_object

    def initialize(request_object)
      @request_object = request_object
    end

    def committee_options
      {
        schema_path: Rails.root.join('schema', 'swagger.yml').to_s,
        prefix: '/public_api/v1'
      }
    end

    def validate_request!
      unless schema_validator.link_exist?
        request = "`#{request_object.request_method} #{request_object.path_info}` undefined in schema."
        raise Committee::InvalidRequest.new(request)
      end

      schema_validator.request_validate(request_object)
    end

    def validate_response!(status, headers, body)
      schema_validator.response_validate(status, headers, [body], true) if validate_response?(status)
    end

    def validate_response?(status)
      Committee::Middleware::ResponseValidation.validate?(status, committee_options.fetch(:validate_success_only, false))
    end

    def schema
      @schema ||= Committee::Middleware::Base.get_schema(committee_options)
    end

    def router
      @router ||= schema.build_router(committee_options)
    end

    def schema_validator
      @schema_validator ||= router.build_schema_validator(request_object)
    end
  end
 end

app/controllers/public_api/v1/base_controller.rb

module PublicApi
  module V1
    class BaseController < ApplicationController
      before_action :validate_request
      after_action :validate_response

      private

      def committee_validator
        @committee_validator ||= ::PublicApi::CommitteeValidator.new(request)
      end

      def validate_request
        committee_validator.validate_request!
      rescue Committee::InvalidRequest => e
        # render_bad_request
      end

      def validate_response
        committee_validator.validate_response!(response.status, response.headers, response.body)
      rescue StandardError => e
        Rails.logger.error("#{e.class}: #{ex.message}\n#{ex.backtrace.join("\n")}")
      end
   end
end

After that, rescue it nicely and change the process according to the specifications. With this kind of feeling, you can introduce it while suppressing the influence on the outside of Public Api!