u-case examples/proposals

just-refactor.rb

class User::Create < Micro::Case
  attributes :name, :age

  def call!
    return invalid_user unless valid?

    if User.create(name: name, age: age)
      Success
    else
      Failure
    end
  end

  private

  def invalid_user
    return Failure(:name_cant_be_blank) if !name_present?
    return Failure(:under_18) if !over_18?
  end

  def valid?
    name.present? && over_18?
  end

  def name_present?
    name.present?
  end

  def over_18?
    age > 18
  end
end

success-and-failure-as-throwables.rb

class User::Create < Micro::Case
  attributes :name, :age

  def call!
    validate
    create
  end

  private

  def validate
    Failure(:name_cant_be_blank) if !name_present?
    Failure(:under_18) if !over_18?
  end

  def create
    user = User.create!(name: name, age: age)
    Success user: user
  rescue
    Failure user_not_created: user.errors
  end

  def name_present?
    name.present?
  end

  def over_18?
    age >= 18
  end
end