gistfile1.rb

class PostCommitmentContext
  #how we're using ruby/rails I thought in something like a rubygem and have a 'config' file in other place.
  twitterable[:twitterFollower,:twitterPoster]
  
  
  def initialize(params)
    @params = params
  end

  def save
    @post = Post.new(@params)
    if @post.save 
      # @post is probably ActiveRecord, so there's nothing to extend      
      twitter.post(@post.body)
    end
  end

  def save_comment
    @comment = Comment.new(@params)
    # ... instantiates Model
    if @comment.save       
      twitter.follow(@comment.twitter_nickname)
    end
  end
end

class PostsController < ActionController::Base
  def create
    @context = PostCommitmentContext.new(params[:posts])
    if @context.save
      # redirect
      # ...
    end
  end
end


class Twitter
  def initialize(user) 
    @twitter = Twitter::API.login(user[:login], user[:password]) # fake API class
  end
end

module TwitterPoster
  def post(body)
    # calls Twitter API
  end

  def parse_tweet_body
    # ...
  end

  # other methods related to posting on Twitter
end

module TwitterFollower
  def follow(body)
    # calls Twitter API
  end

  # other methods related to following on Twitter
end