Created
August 14, 2015 18:42
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| # CheckedAttributes Challenge | |
| module CheckedAttributes | |
| class ValidationError < StandardError; end | |
| def self.included(base) | |
| base.extend(self) | |
| end | |
| def attr_checked attribute, &block | |
| attr_reader attribute | |
| define_method "#{attribute}=" do |value| | |
| raise ValidationError unless block.call(value) | |
| instance_variable_set("@#{attribute}", value) | |
| end | |
| end | |
| end | |
| class Person | |
| include CheckedAttributes | |
| attr_checked :age do |v| | |
| v >= 18 | |
| end | |
| end | |
| require "minitest/autorun" | |
| describe "CheckedAttributes" do | |
| before do | |
| @subject = Person.new | |
| end | |
| it "raises an error if the validation fails" do | |
| @subject .age = 18 | |
| assert_equal @subject .age, 18 | |
| end | |
| it "raises an error if the validation fails" do | |
| assert_raises(CheckedAttributes::ValidationError) { @subject.age = 12 } | |
| end | |
| end |
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