Last Update: 2017-08-18 07:20:31 -0700

New Plugins

  • A static_path_info plugin has been added, which doesn’t modify SCRIPT_NAME/PATH_INFO during routing, only before dispatching the request to another rack application via r.run. This is faster and avoids problems caused by changing SCRIPT_NAME/PATH_INFO during routing, such as methods that return paths that depend on SCRIPT_NAME. This behavior will become Roda’s default starting in Roda 2, and it is recommended that all Roda apps use it.

  • A mailer plugin has been added, which allows you to use Roda’s render plugin to create email bodies, and allows you to use Roda’s routing tree features to DRY up your mailing code similar to how it DRYs up your web code.

    Here is an example routing tree using the mailer plugin:

    class Mailer < Roda
      plugin :render
      plugin :mailer
      route do |r|
        r.on "user/:d" do |user_id|
          # DRY up code by setting shared behavior in higher level
          # branches, instead of duplicating it inside each subtree.
          @user = User[user_id]
          from 'notifications@example.com'
          to @user.email
          r.mail "open_account" do
            subject 'Welcome to example.com'
          r.mail "close_account" do
            subject 'Thank you for using example.com'

    With your routing tree setup, you can use the sendmail method to send email:


    If you want a Mail::Message object returned for further modification before sending, you can use mail instead of of sendmail:

  • A delegate plugin has been added, allowing you to easily create methods in the route block scope that delegate to the request or response. While Roda does not pollute your namespaces by default, this allows you to choose to do so yourself if you find it offers a nicer API. Example:

    class App < Roda
      plugin :delegate
      request_delegate :root, :on, :is, :get, :post, :redirect
      route do |r|
        root do
          redirect "/hello"
        on "hello" do
          get "world" do
            "Hello world!"
          is do
            get do
            post do
              puts "Someone said hello!"
  • A class_level_routing plugin has been added, allowing you to define your routes at the class level if desired. The routes defined at the class level can still use a routing tree for further routing. Example:

    class App < Roda
      plugin :class_level_routing
      root do
        request.redirect "/hello"
      get "hello/world" do
        "Hello world!"
      is "hello" do
        request.get do
        request.post do
          puts "Someone said hello!"
  • A named_templates plugin has been added, for creating inline templates associated with a given name, that are used by the render plugin’s render/view method in preference to templates stored in the filesystem. This makes it simpler to ship single-file Roda applications that use templates. Example:

    class App < Roda
      plugin :named_templates
      template :layout do
        "<html><body><%= yield %></body></html>"
      template :index do
        "<p>Hello <%= @user %>!</p>"
      route do |r|
        @user = 'You'
      # => "<html><body><p>Hello You!</p></body></html>"
  • A multi_run plugin has been added, for dispatching to multiple rack applications based on the request path prefix. This provides a similar API as the multi_route plugin, but allows you to separate your applications per routing subtree, as opposed to multi_route which uses the same application for all routing subtrees.

    With the multi_run plugin, you call the class level run method with the routing prefix and the rack application to use, and you call r.multi_run to dispatch to all of the applications based on the prefix.

    class App < Roda
      plugin :multi_run
      run "foo", Foo
      run "bar", Bar
      run "baz", Baz
      route do |r|

    In this case, Foo, Bar, and Baz, can be subclasses of App, which allows them to share methods that should be shared, but still define methods themselves that are not shared by the other applications.

  • A sinatra_helpers plugin has been added, that ports over most of the Sinatra::Helpers methods that haven’t already been added by other plugins. All of the methods are added either to the request or response class as appropriate. By default, delegate methods are also added to the route block scope, but you can turn this off by passing a :delegate=>false option when loading the plugin, which avoids polluting the route block namespace.

    The sinatra_helpers plugin adds the following request methods:

    • back

    • error

    • not_found

    • uri

    • send_file

    And the following response methods:

    • body

    • body=

    • status

    • headers

    • mime_type

    • content_type

    • attachment

    • informational?

    • success?

    • redirect?

    • client_error?

    • not_found?

    • server_error?

  • A slash_path_empty plugin has been added, which changes Roda so that “/” is considered an empty path when doing a terminal match via r.is or r.get/r.post with a path.

    class App < Roda
      plugin :slash_path_empty
      route do |r|
        r.get "albums" do
          # matches both GET /albums and GET /albums/
  • An empty_root plugin has been added, which makes r.root match the empty string, in addition to /. This can be useful in cases where a partial match on the patch has been completed.

    class App < Roda
      plugin :empty_root
      route do |r|
        r.on "albums" do
          r.root do
            # matches both GET /albums and GET /albums/
  • A match_affix plugin has been added, for overriding the default prefix/suffix used in match patterns. For example, if you want to require that a leading / be specified in your routes. and you want to consume any trailing slash:

    class App < Roda
      plugin :match_affix, "", /(\/|\z)/
      route do |r|
        r.on "/albums" do |s|
          # GET /albums # s => ""
          # GET /albums/ # s => "/"
  • An environments plugin has been added, giving some simple helpers for executing code in different environments. Example:

    class App < Roda
     plugin :environments
     environment  # => :development
     development? # => true
     test?        # => false
     production?  # => false
     # Set the environment for the application
     self.environment = :test
     test?        # => true
     configure do
       # called, as no environments given
     configure :development, :production do
       # not called, as no environments match
     configure :test do
       # called, as environment given matches current environment
  • A drop_body plugin has been added, which automatically drops the body, Content-Type header, and Content-Length header when the response status indicates no body (100-102, 204, 205, 304).

  • A delay_build plugin has been added, which delays building the rack application until Roda.app is called, and only rebuilds the rack application if build! is called. This removes O(n^2) performance in the pathological case of adding a route block and then calling Roda.use many times to add middlewares, though you have to add a few hundred middlewares for the difference to be noticeable.

New Features

  • r.remaining_path and r.matched_path have been added for returning the remaining path that will be used for matching, and for returning the path already matched. Currently, these just provide the PATH_INFO and SCRIPT_NAME, but starting in Roda 2 PATH_INFO and SCRIPT_NAME will not be modified during routing, and you’ll need to use these methods if you want to find out the remaining or already matched paths.

  • The render plugin now supports a :template option to render/view to specify the template to use, instead of requiring a separate argument.

  • The render plugin now supports a :template_class option, allowing you to override the default template class that Roda would use.

  • The render plugin now supports a :template_block option, specifying the block to pass when creating a template.

  • The path class method added by the path plugin now accepts :name, :url, :url_only, and :add_script_name options:


    Specifies name for method


    Creates a url method in addition to a path method


    Only creates a url method, not a path method


    prefixes the path with SCRIPT_NAME

    Note that if you plan to use :add_script_name, you should use the static_path_info plugin so that the method created does not return different results depending on where you are in the routing tree.

  • A :user_agent hash matcher has been added to the header_matchers plugin.

  • An inherit_middleware class accessor has been added. This can be set to false if you do not want subclasses to inherit middleware from the superclass. This is useful if the superclass dispatches to the subclass via r.run, as otherwise it would have to run the same middleware stack twice.

  • A clear_middleware! class accessor has been added, allowing you to clear the current middleware stack.

  • RodaRequest#default_redirect_status has been added, allowing plugins to override the default status used for redirect if a status is not given.

  • Roda{Request,Response}#roda_class has been added, which returns the Roda class related to the given request/response.

Other Improvements

  • The render plugin no longer caches templates by default if RACK_ENV is development.

  • When subclassing a Roda app, unfrozen Array/Hash entries in the opts hash are now duped into the subclass, so the subclass no longer needs to dup them manually. Note that plugins that use nested arrays/hashes in the opts hash still need to dup manually inside ClassMethods#inherited. For the plugins where it is possible, it is recommended to store plugin options in a frozen object in the opts hash, and require loading the plugin again to modify the plugin options.

  • Caching of templates is now fixed when the render/view :opts is used to specify template options per-call.

  • An explicit :default_encoding of nil in the render plugin’s :opts hash is no longer overwritten with Encoding.default_external.

  • Roda#session now returns the same object as RodaRequest#session.

  • The view_subdirs, content_for, and render_each plugins now all depend on the render plugin.

  • The not_allowed plugin now depends on the all_verbs plugin.

  • Local/instance variables are now used in more places instead of method calls, improving performance.

Backwards Compatibility

  • The render plugin’s render/view methods no longer pass the given hash directly to the underlying template. To pass options to the template engine, use a separate hash under the :opts key:

    render :file, :opts=>{:foo=>'bar'}

    This is more consistent with the class-level render plugin options, which also uses :opts to pass options to the template engine.

    The :js_opts and :css_opts options to the assets plugin are now passed as the :opts hash, so they continue to affect the template engine, so they no longer specify general render method options.

  • Modifying render_opts :layout after loading the render plugin now has no effect. You need to use plugin :render, :layout=>‘…’ to set the layout to use now.

  • Default headers are not set on a response until the response is finished. This allows you to check for header presence during routing to detect whether the header was specifically set for the current request.

  • RodaRequest.consume_pattern no longer captures anything by default. Previously, it did so in order to update SCRIPT_NAME, but that is now handled differently. This should only affect external plugins that attempt to override RodaRequest#consume.

  • RodaRequest.def_verb_method has been removed.

  • The hooks, default_headers, json, and multi_route plugins all store their class-level metadata in the opts hash instead of separate class instance variables. This should have no affect unless you were accessing the class instance variables directly.

  • The render plugin internals changed significantly, it now passes internal data using a hash. This should only affect users that were overriding render plugin methods.