From: Luis Lavena <luislavena@...>
Date: 2010-08-04T20:50:06+09:00
Subject: Re: Rails3 Engines (mountable apps)

On Aug 4, 8:33 am, "H.J. Blok" <hj.b...@gmail.com> wrote:
> Hello,
>
> I've a question about Rails 3 Engines. I'm looking everywhere for good
> documentation on this subject, but didn't find it.
>
> I'm trying to create a mountable app (embedding a Rails application in
> another Rails application). Both the 'base' application and the
> 'embedded' application are created with rails3.0.0.rc. To behave as
> Engine the 'embedded' application has the following code in
> 'lib/my_engine.rb':
>
> # lib/my_engine.rb
> require "my_engine"
> require "rails"
>
> module MyEngine
>   class Engine < Rails::Engine
>   end
> end
>
> In the Gemfile of the 'base' application I've included MyEngine as a
> gem, using the path directive (to be able to change code without
> rebuilding the gem).
>
> # Gemfile
> gem "my_engine", :path => "../my_engine"
>
> When I try to start the 'base' application it raises a NameError:
>
> uninitialized constant MyEngine::Application (NameError)
>
> Does anybody have good (Rails3 RC based) documentation on how to create
> a mountable app?
>
> And what would be the 'Rails-way' of solving this problem?
>

Please look at enginex:

http://github.com/josevalim/enginex

It creates an engine template for rails 3, generate one and take a
look comparing with your version.

Indeed there is no plenty of documentation, so you should inspect by
example.

Also, you will get more help and better responses in a Ruby on Rails
group/mailing list, like ror talk:

http://groups.google.com/group/rubyonrails-talk

HTH,
--
Luis Lavena