u-attributes: using accept to validate the attributes

01.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'u-attributes', '~> 2.6.0'
end

class SumNumbers
  include Micro::Attributes.with(:initialize, accept: :strict)

  attribute :numbers, accept: -> arg do
    arg.is_a?(Array) && arg.all? { |value| value.is_a?(Numeric) }
  end

  def call
    numbers.reduce(:+)
  end
end

puts SumNumbers.new(numbers: [1, 2, 3]).call
# 6

puts SumNumbers.new(numbers: [1, '2', 3]).call
# One or more attributes were rejected. Errors: (ArgumentError)
# * "numbers" is invalid

02.rb

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'u-attributes', '~> 2.6.0'
end

ArrayOf = -> kind do
  -> arg { arg.is_a?(Array) && arg.all? { |value| value.is_a?(kind) } }
end

class SumNumbers
  include Micro::Attributes.with(:initialize, accept: :strict)

  attribute :numbers, accept: ArrayOf[Numeric]

  def call
    numbers.reduce(:+)
  end
end

puts SumNumbers.new(numbers: [1, 2, 3]).call
# 6

puts SumNumbers.new(numbers: [1, '2', 3]).call
# One or more attributes were rejected. Errors: (ArgumentError)
# * "numbers" is invalid