facts_controller.rb

  def create
    @number = Number.find_or_create_by_value(:value => params[:value])
    
    if not @number.valid?
      @fact = Fact.new(params[:fact])
      @intended_value = @number.value
      render 'facts/new' and return
    end

    @fact = @number.facts.new(params[:fact])
    if @fact.save
      session[:votes] << @fact.id
      redirect_to number_path(@number)
    else
      render 'facts/new'
    end
  end