Ruby 3.1.2中CSV文件行删除的邮箱校验功能实现问题

需要在Ruby 3.1.2环境下处理车辆信息CSV文件，实现以下逻辑：

• 用户输入邮箱时，若输入的不是CSV中存在的有效邮箱，需提示重新输入直到正确
• 输入正确邮箱后，删除对应行并更新CSV
  现有代码可实现行删除，但缺少邮箱有效性校验环节，导致无效邮箱输入仍会执行后续操作。

车辆信息CSV示例 #

make,model,color,doors,email
dodge,charger,black,4,practice1@whatever.com
ford,focus,blue,5,practice2@whatever.com
nissan,350z,black,2,practice3@whatever.com
mazda,miata,white,2,practice4@whatever.com
honda,civid,brown,4,practice5@whatever.com
corvette,stingray,red,2,practice6@whatever.com
ford,fiesta,blue,5,practice7@whatever.com
bmw,m4,black,2,practice8@whatever.com
audi,a5,blue,2,practice9@whatever.com
subaru,brz,black,2,practice10@whatever.com
lexus,rc,black,2,practice11@whatever.com

现有代码（缺少校验） #

def delete_from_data
    print "\nTo delete a car, enter the email (this is case sensitive): \n> "
    delete_car = gets.chomp

    #this allows me to delete a certain row based on email
    table = CSV.table("cars.csv")
    table.delete_if do |row|
        row[:email] == delete_car
    end
    File.open("cars.csv", "w") do |f|
        f.write(table.to_csv)
    end

    #this shows the updated student roster after deleting user
    puts "\nThis is the updated roster after deleting: #{delete_car}"
end 

补充校验后的完整代码 #

require 'csv'

def delete_from_data
  # 读取CSV并提取所有有效邮箱
  table = CSV.table("cars.csv")
  valid_emails = table.map { |row| row[:email] }

  # 循环获取输入，直到用户输入有效邮箱
  loop do
    print "\nTo delete a car, enter the email (this is case sensitive): \n> "
    delete_car = gets.chomp

    if valid_emails.include?(delete_car)
      # 邮箱有效，执行删除操作
      table.delete_if { |row| row[:email] == delete_car }
      File.open("cars.csv", "w") { |f| f.write(table.to_csv) }
      puts "\nThis is the updated roster after deleting: #{delete_car}"
      break # 退出循环
    else
      # 邮箱无效，提示重新输入
      puts "Error: Email not found. Please enter a valid email from the list."
    end
  end
end

核心修改点 #

• 提前读取CSV并提取所有valid_emails，用于后续合法性校验
• 使用loop循环实现重复输入提示，直到用户输入有效邮箱
• 通过valid_emails.include?(delete_car)判断输入是否合法，仅合法时才执行删除和文件更新操作
• 无效输入时给出明确提示，引导用户重新输入

内容的提问来源于stack exchange，提问作者burner