Benchmark rendering of Rails view in rake file

benchmark.rake

namespace :benchmarks do
  desc 'With cache'
  task cache: :environment do
    class RakeActionView < ActionView::Base
      include Rails.application.routes.url_helpers
      include ::ApplicationHelper

      def default_url_options
        { host: 'localhost:3000' }
      end

      def protect_against_forgery?
        false
      end
    end
    controller = ActionController::Base.new
    controller.class_eval do
      include Rails.application.routes.url_helpers
      include ::ApplicationHelper
    end
    controller.request = ActionDispatch::TestRequest.new
    view               = RakeActionView.new(Rails.root.join('app', 'views'), {}, controller)

    member    = Member.find_by_name('Natalie Sung')
    candidate = Candidate.find(777479348)
    params    = {
      current_member: member,
      candidate:      candidate,
      was_unread:     candidate.unread_by?(member.id),
      collaboration:  Collaboration.where(job_id: candidate.job_id, member_id: member.id).first
    }
    view.assign(params)

    Benchmark.bmbm() do |x|
      x.report 'candidate_show' do
        view.render(inline: "/#{Rails.root}/app/views/backend/api/candidates/show.json.jbuilder", layout: false)
      end

      x.report 'candidate_with_cache' do
        view.render(inline: "/#{Rails.root}/app/views/backend/api/candidates/show.json.jbuilder", layout: false, use_cache: true)
      end

    end
  end
end