Question

I want to put template files in defferent directories. (foo/, bar/)

How do you write using Sinatra?

This way get wrong.

Answer 1

From the documentation:

set :views, Proc.new { File.join(root, "templates") }

If you want to use multiple directories (also from the docs):

set :views, ['views', 'templates']

helpers do
  def find_template(views, name, engine, &block)
    Array(views).each { |v| super(v, name, engine, &block) }
  end
end

By the way, you need to reference templates with symbols, not strings. So the complete code would be:

require 'rubygems'
require 'sinatra'
require 'haml'

set :views, ['foo', 'bar']

helpers do
  def find_template(views, name, engine, &block)
    Array(views).each { |v| super(v, name, engine, &block) }
  end
end

get '/' do
  haml :index, :layout => :bar
end

and you have these files:

foo/index.haml
bar/bar.haml