How to save country-specific bank details?

I am currently developing a rails application which should accept country-specific bank account details.

For example:

German Bank Details:
Kontoinhalber: Alice Springs
Kontonummer: 1234567
Bankleitzahl: 111111111

French Bank Details:
Numéro de compte: 0987654
Clé RIB: 123
Code banque: 12345开发者_如何转开发
Code guichet: 1234

How can I save this different formats to the database? Furthermore how can I display different input fields for this?

As you probably do not need to search through these fields, you could use a serialized text field in your model.

Set up a definition for every country, maybe as a constant hash:

BANK_ACCOUNT_FIELDS = {
         # use array to preserve order
  :de => [:account_holder, :account_number, :bank_number], 
  :fr => [:account_number, :bank_key, :bank_code, :branch_code]
}

With this you can access every field like

lang = @bank_account.lang # use this field to know the country settings
BANK_ACCOUNT_FIELDS[lang].each do |field_name|
  @bank_account.data[field_name] = ...
end

For display use partials for each language, for displaying the field names use the I18n module.