Rails 3.1 STI

sample.rb

class Wod < ActiveRecord::Base
  HOST_BOX_NAME = "CrossFit HQ"

  def from_html crossfit_hq_source
    page = Nokogiri::HTML(crossfit_hq_source)
    self.date =  Date.parse(page.search("//h3")[0].inner_text.split[1]).to_s
    self.details = page.search("//p")[0].inner_text
    if(hero_wod || games_wod)
      self.details << "\n" << page.search("//p")[1].inner_html.gsub(/<br>/,"\n")
    end

    wod_id = page.search("//div[@class='blogbody']")[0].search("//a[@name]").attr("name").value
    self.host_box_comment_uri = "http://www.crossfit.com/mt-archive2/00#{wod_id}.html"
    self.host_box_name = HOST_BOX_NAME
  end

  def hero_wod
    self.details.starts_with?("\"")
  end

  def games_wod
    self.details.starts_with?("CrossFit Games")
  end
end


#app/models/wod_crossfit_lackland.rb

class WodCrossFitLackland < Wod
  HOST_BOX_NAME = "CrossFit Lackland"

  def from_html lackland_source
    page = Nokogiri::HTML(lackland_source)
    self.details = page.search("//div[@class='rt-article-content']")[0].inner_text.split("Add new comment")[0]
    self.host_box_comment_uri = ""
    self.host_box_name = HOST_BOX_NAME
    self.date = Date.parse(page.search("//h1[@class='rt-article-title']").inner_text).to_s
  end
end

#ERROR
ruby-1.9.2-p290 :001 > w = Wod.new
 => #<Wod id: nil, date: nil, details: nil, created_at: nil, updated_at: nil, host_box_comment_uri: nil, host_box_name: nil> 
ruby-1.9.2-p290 :003 > WodCrossFitLackland.new
NameError: uninitialized constant WodCrossFitLackland
	from (irb):3
	from /Users/patricksullivan/.rvm/gems/ruby-1.9.2-p290@wodbox/gems/railties-3.1.3/lib/rails/commands/console.rb:45:in `start'
	from /Users/patricksullivan/.rvm/gems/ruby-1.9.2-p290@wodbox/gems/railties-3.1.3/lib/rails/commands/console.rb:8:in `start'
	from /Users/patricksullivan/.rvm/gems/ruby-1.9.2-p290@wodbox/gems/railties-3.1.3/lib/rails/commands.rb:40:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'

I actually decided to move away from class inheritance altogether. Doing special parsing in the model makes it fatter than need be. I instead have segregated parsing to actual "parser" implementations that all return the same model, yet hydrate that model through slightly different means.