Rails plugin require issues

I have a problem creating a Rails plugin, lets call it Mplug. The plugin is pretty much only a rake task, but with a library that the rake task uses.

The problem is to require files. Lets say that this is the rake task:

namespace :mplug do
  task :create do
    Mplug::Indexer.new
  end
end

This will not recognize the constant Mplug. So I thought I needed to require it.

require 'mplug'

namespace :mplug do
  task :create do
    Mplug::Indexer.new
  end
end

But then I get this message.

no such file to load -- mplug

So, ok. Lets try to give the path to the plugin then.

require 'vendor/plugins/mplug/lib/mplug'

namespace :mplug do
  task :create do
    Mplug::Indexer.new开发者_如何学C
  end
end

This actually works. However, except that I guess that this is a bad way to do it, I now have to require the files in my plugin as if I was in the rails root. For example:

module Mplug
end

require 'mplug/indexer'

Now has to be:

module Mplug
end

require 'vendor/plugins/mplug/lib/mplug/indexer'

Which I do not want to do of course.

Is there any neat way to solve this?

Thanks!

---

The easiest solution to this problem would be to register the rake task using the Rails::Railtie API. In lib/mplug.rb, define your Railtie:

module Mplug
  class Railtie < ::Rails::Railtie
    rake_tasks do
      load "mplug/rails.rake"
    end
  end
end

Then, in lib/mplug/rails.rake:

namespace :mplug do
  task :create do
    Mplug::Indexer.new
  end
end

Then, make sure your plugin is defined in your Gemfile. If your plugin is in vendor/plugins, add this line to your Gemfile:

gem "mplug", :path => "vendor/plugins/mplug"

If you push the plugin to a git repo, use :git.

Now, rake mplug:create will be available! If you want it to show up in rake -T, make sure you add a description:

namespace :mplug do
  desc "creating an mplug"
  task :create do
    Mplug::Indexer.new
  end
end

---

One option is to use the FILE constant, and then provide the rest of the path relative to the current file:

require File.join(File.expand_path(File.dirname(__FILE__)), '..', 'lib', 'mplug')

(if your rake task file is in your plugin_root/tasks...)