The GoingPostal mixin provides classes with postcode formatting and validation methods. It does not provide external verification methods such as checking for the existence of a postcode against the UK PAF database.
$ gem install going_postal
GoingPostal can be used as a mixin:
class Address include GoingPostal attr_accessor :number, :street, :city, :postcode, :country_code def initialize(number, street, :city, postcode, country_code="GB") self.number = number self.street = street self.city = city self.postcode = postcode self.country_code = country_code end def postcode=(value) @postcode = format_postcode(value) end def valid? number && street && city && postcode_valid? end end
or as a namespaced collection of methods:
GoingPostal.postcode?("sl41eg", "GB") #=> "SL4 1EG" GoingPostal.postcode?("200378001", "US") #=> "20037-8001"
The methods available are #postcode? for checking validity, and format_postcode which returns a formatted postcode. Both take arguments of a string, the postcode, and a two letter country code. If the class has a #country_code method, the country_code argument on the provided methods becomes optional. If the class also has one of #postcode, #post_code, #zipcode, #zip_code, or #zip, the string argument on the provided methods becomes optional.
postcode? is aliased as post_code?, zip?, zipcode?, zip_code?, valid_postcode?, valid_post_code?, valid_zip?, valid_zipcode?, valid_zip_code?, postcode_valid?, post_code_valid?, zip_valid?, zipcode_valid? and zip_code_valid? The alias valid? is also available directly on the GoingPostal module.
format_postcode is aliased as format_post_code, format_zip, format_zipcode, and format_zip_code.
Contributions are gladly accepted via pull request. When adding new countries or changing existing logic, please keep the following rules in mind for how the formatter / validator should work:
reject something that clearly isn't a postcode;
reject as much as possible as can be done with a simple format check;
do not coerce something that may not be a postcode in to a postcode;
accept badly formatted postcodes (eg wrong case, misplaced spaces/separators);
accept everything that is a postcode.
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