Ruby hash.new错误未定义的局部变量或方法...对于主对象

Question

我试图创建一个新的散列（组），我将传递名称，杂货，fuel_and_accommodations和recreation_activities的值。实际上，最终我需要一个哈希嵌套在组哈希（每个旅行者）。我的问题现在的问题是，我得到这个消息：

未定义的局部变量或方法'组 '主：对象
（REPL）：5：'USER_NAME'
（REPL）：18： `在enter_expenses块
（REPL）：15：在`倍
（REPL）：15：在`enter_expenses'
（REPL）：34：在`”

我只是学习Ruby。任何帮助将不胜感激！

group = Hash.new 

def user_name 
    puts "What is the name of this traveler?" 
    group["name"]= gets.chomp.capitalize 
end 

def enter_expenses 
    puts "Welcome to the Expense Tracker System!\n".upcase 
    puts "__________________________________________" 
    puts "\nUse this system to track your group's expenses when traveling." 
    print "Ready to get started? Enter yes to continue" 
    ready_to_expense = gets.chomp.downcase 


    4.times do 

    if ready_to_expense == "yes" 
     puts "Welcome #{user_name}! Enter your expenses below:\n" 

     puts "Amount spent on groceries:" 
     group["groceries"]= gets.chomp.to_f 

     puts "Amount spent on fuel & accommodations:" 
     group["fuel_and_accommodations"]= gets.chomp.to_f 

     puts "Amount spent recreational activities:" 
     group["recreational_activities"] = gets.chomp.to_f 

    elsif "Please come back when ready to enter your expenses." 
    end 
    end 
end 

enter_expenses 
create_travelers 

puts "__________________________________________" 
puts "Thanks for using the expense tracker system!".upcase 

Answer 1

Ruby中的局部变量没有进入方法;方法声明他们自己的范围，他们不像闭包。您可以使用实例变量来代替：

@group = Hash.new # NOTE @ 

... 

def enter_expenses 
... 
    4.times do 
    if ready_to_expense == "yes" 
     @group["groceries"]= gets.chomp.to_f # NOTE @ 
     ... 
    end 
    end 
end