Created
December 30, 2018 23:17
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| require 'active_model' | |
| class Superhero | |
| include ActiveModel::Validations | |
| @@total = [] | |
| attr_reader :name, :age | |
| def initialize name, age | |
| @name = name | |
| @age = age | |
| end | |
| class << self | |
| def create name:, age: | |
| obj = new name, age | |
| @@total << obj | |
| obj | |
| end | |
| def all | |
| @@total | |
| end | |
| def find_by **args | |
| all.select { |element| element if condition element, **args } | |
| end | |
| def condition elem, **args | |
| if args[:name] && args[:age] | |
| elem.name == args[:name] && elem.age == args[:age] | |
| elsif args[:name] | |
| elem.name == args[:name] | |
| elsif args[:age] | |
| elem.age == args[:age] | |
| end | |
| end | |
| end | |
| validates :age, numericality: { integer: true, greater_than: 0 } | |
| validate :duplicate_names | |
| def duplicate_names | |
| all_names = Superhero.all.collect {|elem| elem.name} | |
| if all_names.count(name) >= 2 | |
| errors.add(:name, "#{name} is already exists") | |
| end | |
| end | |
| end | |
| superhero1 = Superhero.create name: 'Jessy', age: 54 | |
| p superhero1.valid? | |
| p superhero1.errors.messages | |
| superhero2 = Superhero.create name: 'John McClane', age: 12 | |
| p superhero2.valid? | |
| p superhero2.errors.messages | |
| superhero3 = Superhero.create name: 'John McClane', age: 0 | |
| p superhero3.valid? | |
| p superhero3.errors.messages | |
| # p Superhero.all | |
| # p Superhero.find_by name: 'John McClane', age: 0 |
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