activemodel/test/models/topic.rb


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class Topic
  include ActiveModel::Validations
  include ActiveModel::Validations::Callbacks

  def self._validates_default_keys
    super | [ :message ]
  end

  attr_accessor :title, :author_name, :content, :approved
  attr_accessor :after_validation_performed

  after_validation :perform_after_validation

  def initialize(attributes = {})
    attributes.each do |key, value|
      send "#{key}=", value
    end
  end

  def condition_is_true
    true
  end

  def condition_is_true_but_its_not
    false
  end

  def perform_after_validation
    self.after_validation_performed = true
  end

  def my_validation
    errors.add :title, "is missing" unless title
  end

  def my_validation_with_arg(attr)
    errors.add attr, "is missing" unless send(attr)
  end

end