```ruby
module Bouncer
  ##
  # Used to hold all the details about this request and how we might redirect it through mappings.
  # Serves as a context for any rendered template.
  class RequestContext
    attr_reader :request

    def initialize(canonicalized_request)
      @request = canonicalized_request
    end

    def host
      @_host ||= Host.find_by(hostname: @request.host)
    end

    def mapping
      # Reminder: the hash is always calculated on the canonicalize!d request
      mappings.find_by path: @request.fullpath
    end

    def mappings
      site.mappings
    end

    def site
      host.site
    end

    def organisation
      site.organisation
    end

    def attributes_for_render
      {
        homepage: site.homepage,
        title: site.homepage_title || organisation.title,
        css: organisation.css,
        furl: site.homepage_furl,
        host: host.hostname,
        suggested_url: mapping.try(:suggested_url),
        archive_url: mapping.try(:archive_url) || default_archive_url
      }
    end

    def render_binding
      RenderingContext.new(attributes_for_render).render_binding
    end

    def default_archive_url
      tna_timestamp = site.tna_timestamp.try(:strftime, '%Y%m%d%H%M%S')
      "http://webarchive.nationalarchives.gov.uk/#{tna_timestamp}/http://#{host.hostname}#{request.non_canonicalised_fullpath}"
    end
  end
end
```

Tidy up comment referring to hash
user
```ruby
module Bouncer
  ##
  # Used to hold all the details about this request and how we might redirect it through mappings.
  # Serves as a context for any rendered template.
  class RequestContext
    attr_reader :request

    def initialize(canonicalized_request)
      @request = canonicalized_request
    end

    def host
      @_host ||= Host.find_by(hostname: @request.host)
    end

    def mapping
      # Reminder: the request's fullpath is canonical
      mappings.find_by path: @request.fullpath
    end

    def mappings
      site.mappings
    end

    def site
      host.site
    end

    def organisation
      site.organisation
    end

    def attributes_for_render
      {
        homepage: site.homepage,
        title: site.homepage_title || organisation.title,
        css: organisation.css,
        furl: site.homepage_furl,
        host: host.hostname,
        suggested_url: mapping.try(:suggested_url),
        archive_url: mapping.try(:archive_url) || default_archive_url
      }
    end

    def render_binding
      RenderingContext.new(attributes_for_render).render_binding
    end

    def default_archive_url
      tna_timestamp = site.tna_timestamp.try(:strftime, '%Y%m%d%H%M%S')
      "http://webarchive.nationalarchives.gov.uk/#{tna_timestamp}/http://#{host.hostname}#{request.non_canonicalised_fullpath}"
    end
  end
end
```
assistant