[rails] Running Erubis on Edge Rails

ActionView class was refactoring on Edge Rails, see Ticket #10437 for more details. The template engines are integrated into new ActionView::Template class, but we have to modify some scripts in order to run Erubis on Edge Rails.

0. Install Erubis and Edge Rails

% sudo gem install erubis
% cd /path/to/rails_app/ && rake rails::freeze:edge

1. Create a template handler for Erubis.

Copy and paste below code at #{RAILS_ROOT}/lib/erubis_rails_helper.rb.

require 'erubis'
require 'erubis/preprocessing'

module Erubis
class Eruby
include ErboutEnhancer
end

class FastEruby
include ErboutEnhancer
end
end

module ActionView
module TemplateHandlers
class Erubis < TemplateHandler
 include Compilable

 # Erubis engine class
 cattr_accessor :engine_class
 @@engine_class = ::Erubis::Eruby

 # Properties
 cattr_accessor :init_properties
 @@init_properties = {}

 # Enable preprocessing if true
 cattr_accessor :preprocessing
 @@preprocessing = false

 def compile(template)
   if preprocessing
     preprocessor = ::Erubis::PreprocessingEruby.new(template, init_properties)
     template = preprocessor.evaluate(@view)
   end
   engine_class.new(template, init_properties).src
 end
end
end
end
ActionView::Template.register_default_template_handler :erb, ActionView::TemplateHandlers::Erubis
ActionView::Template.register_template_handler :rhtml, ActionView::TemplateHandlers::Erubis

2. Configure settings of Erubis in enviroment.rb.

Append below scripts in config/enviroment.rb

require 'erubis_rails_helper'
ActionView::TemplateHandlers::Erubis.engine_class = Erubis::FastEruby
ActionView::TemplateHandlers::Erubis.preprocessing = true

Restart the web server.