ruby-on-rails - 模型文件中的Ruby on Rails IBAN验证

我正在尝试对任何国家的iban代码进行iban验证我从stackoverflow那里得到了一些构建代码的帮助，但是我仍然有一些问题，我不知道它在哪里。
我总是收到“这不是有效的IBAN”错误消息但有时我会尝试将IBAN代码定义为正确的国家。
在代码中有人帮我做这个验证吗？
代码在这里：

  class BankAccount < ActiveRecord::Base
  belongs_to :user

  validates :bank_name, presence: true
  validate :iban, :valid_iban?, presence: true

  private

    def valid_iban?
            ibans = iban.upcase.scan(/\w/).join

            ibans = ibans.gsub(/_/, '')

            iban_length = ibans.length

            country = ibans.scan(/\A../).join

            length_correct_for_country = true

            case country
                when "IE"
                    if iban_length == 22
                        length_correct_for_country = true
                    else
                        length_correct_for_country = false
                    end
                when "AL"
                    if iban_length == 28
                        length_correct_for_country = true
                    else
                        length_correct_for_country = false
                    end
                when "TR"
                    if iban_length == 26
                        length_correct_for_country = true
                    else
                        length_correct_for_country = false
                    end
                when "GB"
                    if iban_length == 22
                        length_correct_for_country = true
                    else
                        length_correct_for_country = false
                    end
                when "VG"
                    if iban_length == 24
                        length_correct_for_country = true
                    else
                        length_correct_for_country = false
                    end
            end

            first_four_characters = ibans.slice!(0..3)

            reordered_number = ibans + first_four_characters

            letters_removed = []
            reordered_number.scan(/./) do |character|
                case character
                when "A"
                    letters_removed << 10
                when "9"
                    letters_removed <<9
                end
            end

            letters_removed = letters_removed.join.to_i

            remainder = letters_removed % 97

            if remainder == 1 && length_correct_for_country

            else
                remainder = remainder.to_s
                errors.add(:iban, " That is not a valid IBAN. The IBAN that is being supplied")
            end

    end

end

最佳答案

iban-toolsgem可用于此目的，它工作得非常好。
为了在Rails中使用gem，我建议编写一个验证器类。
先把这个放进你的Gemfile：

gem 'iban-tools'

然后运行bundle。
然后创建一个新目录app/validators并在其中创建一个名为iban_validator.rb的文件，其中包含以下内容：

require 'iban-tools'

class IbanValidator < ActiveModel::Validator
  def validate(record)
    unless IBANTools::IBAN.valid?(record.iban)
      record.errors.add :iban, record.errors.generate_message(:iban, :invalid)
    end
  end
end

在你的模特课上写下：

validates_with IbanValidator