gistfile1.rb

  def update
    @style = Style.find(params[:id])

    if @style.update_attributes(params[:style])
      redirect_to add_path
    else
      respond_to do |format|      
        format.html { render action: "edit" }
        format.json { render json: @style.errors, status: :unprocessable_entity }
      end 
    end
  end