controller.rb

class Groups < Application
  # provides :xml, :yaml, :js

  def index
    @groups = Group.all
    display @groups
  end

  def show
    @group = Group.get(params[:id])
    raise NotFound unless @group
    display @group
  end

  def new
    only_provides :html
    @group = Group.new
    render
  end

  def edit
    only_provides :html
    @group = Group.get(params[:id])
    raise NotFound unless @group
    render
  end

  def create
    @group = Group.new(params[:group])
    if @group.save
      redirect url(:group, @group)
    else
      render :new
    end
  end

  def update
    @group = Group.get(params[:id])
    raise NotFound unless @group
    if @group.update_attributes(params[:group]) || !@group.dirty?
      redirect url(:group, @group)
    else
      raise BadRequest
    end
  end

  def destroy
    @group = Group.get(params[:id])
    raise NotFound unless @group
    if @group.destroy
      redirect url(:group)
    else
      raise BadRequest
    end
  end

end # Groups

merb-form.haml

%h1 Create A New Group


= error_messages_for :group

= form_for(@group, :action => url(:groups) ) do |f|
  = partial :form
  %p
    = submit "Create"

= link_to 'Back', url(:groups)