Question

我想从终端写入和读取文件，但我有以下问题

为什么我会收到此错误

in`'：未初始化的常量Order :: ItemContainer（NameError）

-------------------------
class Cart

  attr_reader :items

  include ItemContainer



  def initialize(owner)
    @items=Array.new
    @owner=owner
  end

  def save_to_file
    File.open("#{@owner}_cart.txt","w") do |f|
      @items.each {|i|f.puts "#{i.name}:#{i.price}:#{i.weight}"}# car:100:50
    end
  end

  def read_from_file
    return unless File.exists? ("#{@owner}_cart.txt")
    item_fields=File.readlines("#{@owner}_cart.txt") #"car:100:50\n"
    item_fields.map! {|i|i.chomp} #"car:100:50"
    item_fields.map! {|i|i.split(":")} #["car","100","50"]
    item_fields.each {|i|@items << Item.new(name: i[0],price: i[1].to_i,weight: i[2].to_i)}
    @items.uniq!
  end

end

这是我的计划的第二部分

------------------------
module ItemContainer

  module ClassMethods

    def min_price
      100
    end

  end

  module InstanceMethods

    def add_item(item)
      unless item.price<self.class.min_price
        @items.push item
      end
    end

    def remove_item
      @items.pop
    end

    def shift_item
      @items.shift
    end

    def validate
      @items.each {|i|puts "Item has no price" if i.price.nil?}
    end

    def delete_invalid_items
      @items.delete_if {|i| i.price.nil?}
    end

    def count_valid_items
      @items.count {|i| i.price}
    end

  end

  def self.included(base)
    base.extend ClassMethods
    base.class_eval do
      include InstanceMethods
    end
  end

end

我认为回调和模块正常 ----------------------

require_relative "item_container" require_relative "cart"
require_relative "order" require_relative "item" require_relative
"real_item" require_relative "virtual_item"


@items=[]
@items<<VirtualItem.new({:price=>101,:weight=>20,:name=>'car'})
@items<<RealItem.new({:price=>101,:weight=>20,:name=>'kettle'})
@items<<RealItem.new({:price=>101,:weight=>20,:name=>'dishwasher'})

在`<class：order>'中：未初始化的常量Order :: ItemContainer（NameError）

0 个答案: