before_action使用示例

module Admin
  class InvitesController < Admin::ApplicationController
  # 调用 show edit update destroy 方法前调用set_invite 方法
    before_action :set_invite, only: [:show, :edit, :update, :destroy]
  
    def index
      @invites = Invite.order('id desc')
      @invites = @invites.paginate(page: params[:page], per_page: 30)
    end
  
    def show
      @subscriptions = @invite.subscriptions.paginate(page: params[:page], per_page: 30)
    end
  
    def new
      @invites = Invite.new
    end
  
    def edit
    end
  
    def create
      @invites = Invite.new(params[:admin_invites_path].permit!)
      if @invite.save
        redirect_to(admin_invites_url, notice: '创建成功。')
      else
        render action: "new"
      end
    end
  
    def update
      if @invite.update_attributes(params[:invite].permit!)
        redirect_to(admin_invites_url, notice: '更新成功。')
      else
        render action: "edit"
      end
    end
  
    def destroy
      @invite.destroy
      redirect_to(admin_invites_url, notice: "删除成功。")
    end
  
    private
  
    def set_invite
      @invite = Invite.find(params[:id])
    end
  end

end