cfis

or

class MyController < ApplicationController
  def list
  end
end

class MyController < ApplicationController
  def list
    render(:template => 'not_the_default_template')
  end
end

def create_template_source(extension, template, render_symbol, locals)
  if template_requires_setup?(extension)
    body = case extension.to_sym
    when :rxml
      "xml = Builder::XmlMarkup.new(:indent => 2)\n" +
      "@controller.headers['Content-Type'] ||= 'application/xml'\n" +
      template
    when :rjs
      "@controller.headers['Content-Type'] ||= 'text/javascript'\n" +
      "update_page do |page|\n#{template}\nend"
   end
  else
    body = ERB.new(template, nil, @@erb_trim_mode).src
  end
  
  @@template_args[render_symbol] ||= {}
  locals_keys = @@template_args[render_symbol].keys | locals
  @@template_args[render_symbol] = locals_keys.inject(
                                    {}) { |h, k| h[k] = true; h }
  locals_code= ""
  locals_keys.each do |key|
    locals_code << "#{key} = local_assigns[:#{key}]
                         if local_assigns.has_key?(:#{key})\n"
  end
  
  "def #{render_symbol}(local_assigns)\n#{locals_code}#{body}\nend"
end

For ERB:
<!-- template_type :erb -->

For RJS:
# template_type :rjs

For Builder:
<!-- template_type :erb -->

class ProductController < ApplicationController
  include RestController

  def get
    @product_pages, @products = paginate :products, :per_page => 10
  end

  def post
    @product = Product.new(params[:product])
    begin
      @product.save!
      flash[:notice] = 'Product was successfully created.'
      redirect_to :resource => :collection
    rescue => e
      flash[:product] = @product
      redirect_to :resource => :creator
    end
  end
  
  resource :Member do
    def get
      @product = Product.find(params[:id])
    end

    def put
      @product = Product.find(params[:id])
      begin
        @product.update_attributes(params[:product])
        flash[:notice] = 'Product was successfully updated.'
        redirect_to :id => @product
      rescue => e
        # Send the current invalid values to the editor via the flash
        flash[:product] = @product
        redirect_to :resource => :editor, :id => @product
      end
    end

    def delete
      Product.find(params[:id]).destroy
      redirect_to :id => nil, :resource => nil
    end
  end

  resource :Creator do
    def get
      @product = flash[:product] ||  Product.new
    end
  end
  
  resource :Editor do
    def get
      @product = flash[:product] || Product.find(params[:id])
    end
  end
end

# Copyright (c) 2006 MapBuzz
# Released under the MIT License
# Author: Charlie Savage

module ActionView
  class Base
    def pick_template_extension(template_path)#:nodoc:
      if match = delegate_template_exists?(template_path)
        match.first
      else
        negotiate_content(template_path)
      end
    end

    def negotiate_content(template_path)
      result = 'rhtml'
      
      if !controller.respond_to?(:request)
        return result 
      end
      
      negotiator = ContentNegotiator.new
          (controller.request.env['HTTP_ACCEPT'])

      # In order of preference, as specified by the client via
      # HTTP_ACCEPT, check to see if we can produce the media type 
      negotiator.media_types.each do |media_type|
        extension = media_type.extension
        if media_type.extension and
          template_exists?(template_path, extension)
          result = extension
          # Break out of this block
          break
        end
      end

      # If all else fails return rhtml
      result
    end
  end
end
    

<%= render(:partial => 'layouts/doctype') %>

<!DOCTYPE HTML PUBLIC 
 "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<% controller.response.headers["Content-Type"] = MediaType::HTML %>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC 
 "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<% controller.response.headers['Content-Type'] = MediaType::XHTML %>

Content Type	Template Name
text/html	list.rhtml
application/xhtml+xml	list.rxhtml
text/javascript, application/javascript	list.rjs
application/atom+xml	list.ratom
application/atom+rss	list.rss
application/x-yaml	list.ryaml

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Resource	GET	POST	PUT	DELETE
products	list	create
each product	show		update	destroy
creator	new
editor	edit