rails 增删改查

class InvoicesController < ApplicationController

  def index
    @invoices = Invoice.all
  end

  def show
    @invoice = Invoice.find(params[:id])
  end

  def new
    @invoice = Invoice.new
  end

  def edit
    @invoice = Invoice.find(params[:id])
  end

  def update
    @invoice = Invoice.find(params[:id])
    if @invoice.update(invoice_params)
      redirect_to invoice_path(@invoice) 
    else
      render :edit
    end
  end

  def create
    @invoice = Invoice.new(invoice_params)
    if @invoice.save
      redirect_to @invoice
    else
      render :new
    end
  end

  def destroy
    @invoice = Invoice.find(params[:id])
    @invoice.destroy
    redirect_to :action => :index
  end

  private

    def invoice_params
      params.require(:invoice).permit(:standard, :unit, :amount, :tax_unit_price, :tax_total, :cess, :tax_money)
    end
end