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require 'active_model'
class Person
include ActiveModel::Conversion
include ActiveModel::Validations
validates_presence_of :name
attr_accessor :name
def initialize(attributes = {})
@name = attributes[:name]
end
def persist
@persisted = true
end
def persisted?
@persisted
end
end
person1 = Person.new
p person1.valid? # => false
p person1.errors.messages # => {:name=>["can't be blank"]}
person2 = Person.new(:name => "matz")
p person2.valid? # => true
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