Live code - u-case 101

u_case.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'u-case'
  gem 'pry'
end

class Sum < Micro::Case
  attributes :a, :b

  def call!
    if a.kind_of?(Numeric) && b.kind_of?(Numeric)
      Success(number: a + b)
    else
      Failure(:attributes_must_be_numerics)
    end
  end
end

Sum
  .call(a: 1, b: 2)
  .on_success { |result| puts result[:number] }
  .on_failure { puts 'Oops' }

class Double < Micro::Case
  attribute :number

  def call!
    if number.kind_of?(Numeric)
      Success(number: number * 2)
    else
      Failure(:attributes_must_be_numerics)
    end
  end
end

# SumNumberAndDouble = Micro::Case::Flow([
#   Sum, Double
# ])

# class SumNumberAndDouble < Micro::Case
#   flow Sum,
#     Double
# end

class SumNumberAndDouble < Micro::Case
  flow Sum,
    self.call!

  attribute :number

  def call!
    if number.kind_of?(Numeric)
      Success(number: number * 2)
    else
      Failure(:attributes_must_be_numerics)
    end
  end
end

Sum
  .call(a: 2, b: 2)
  .then(Double)
  .on_success { |result| puts result[:number] }
  .on_failure { puts 'Oops' }