domain.rb

  def find_blog
    case request.host

    when "www.#{Setting.host}", Setting.host, nil
      @current_blog = Blog.find_by_subdomain(request.subdomain)
    else     
      
      if request.host.index(Setting.host)
        @current_blog = Blog.find_by_subdomain(request.host.split('.').first)
      else
        @current_blog = Blog.find_by_fqdn(request.host)
      end
    
      if !@current_blog
        redirect_to Setting.domain
      end

    end  

  end