我正在使用Ruby on Rails创建直接借记表格。
我已经设置了表单,并设置了一些基本验证以确保填写所有字段。
接下来,我想设置一些验证来检查 IBAN(国际银行帐号)号码是否是有效的 IBAN。
这涉及操作字符串、将其更改为数字并进行一些数学运算的几个步骤,所有这些我都编写了一个方法。
我的问题是我似乎无法将 IBAN 传递到方法中进行验证。
我的验证:
class DirectDebit < ActiveRecord::Base
attr_accessible :address, :amount, :bank_branch, :bic, :date_for_payment, :email, :iban, :name, :name_of_account, :phone
validates :address, :bank_branch, :bic, :date_for_payment, :email, :name, :name_of_account, :phone, presence: true
validates :amount, numericality: {greater_than_or_equal_to: 0.01}
validate :iban
def iban
## Converts all letters in 'number' to uppercase and removes any spaces and anything else that isn't a letter, number or underscore
iban = iban.upcase.scan(/\w/).join
## removes any underscores as ".scan(/\w/)" above reads in letters digits and underscores.
iban = iban.gsub(/_/, '')
## Calculates the length of 'number'
iban_length = iban.length
## Saves the first two letters in 'number' as 'country'
country = iban.scan(/\A../).join
## Checks if the length is correct for the country
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 "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
## Identifies what the first 4 characters are, and removes them from the rest of the number
first_four_characters = iban.slice!(0..3)
## Adds the first four characters to the end of the rest
reordered_number = iban + first_four_characters
## Set up an array and have each character in the reordered number read into it, changing it to the appropriate number if it is a letter.
letters_removed = []
reordered_number.scan(/./) do |character|
case character
when "A"
letters_removed << 10
...
when "9"
letters_removed <<9
end
end
## Change the array to a String and then to a number
letters_removed = letters_removed.join.to_i
## Check to see if it gives a remainder of one when divided by 97
remainder = letters_removed % 97
## Output that it is a valid number if the remainder when it is divided by 97 is 1 and if it is the correct length for the country.
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 is: " + special)
end
end
end