Scoped variables localistico

intersected_variables.rb

# frozen_string_literal: true

##
# Variables resulting from the intersection two or more variables
# It's used by TemplateGallery to perform validation
class Variables::IntersectedVariables < Variables

  def initialize(list)
    @list = list
  end

  Variables.new.members.each do |name|
    define_method name do
      values = @list.map { |variables| variables.public_send(name) }
      return nil if values.any?(nil)

      return values.compact.first
    end
  end

end

intersected_variables_spec.rb

# frozen_string_literal: true

RSpec.describe Variables::IntersectedVariables do
  let(:one) { Variables.new(canonical_tag: '1') }
  let(:two) { Variables.new(canonical_tag: '2', location: '2') }
  let(:three) { Variables.new(canonical_tag: '3', location: '3', area: '3') }
  let(:variables) { Variables::IntersectedVariables.new([one, two, three]) }

  it 'uses hierarchy to find values' do
    expect(variables.canonical_tag).to eq '1'
    expect(variables.location).to be_nil
    expect(variables.area).to be_nil
    expect(variables.business).to be_nil
  end
end

scoped_variables.rb

# frozen_string_literal: true

##
# Variables that uses a list of other variables to find values hierarchically
# (Not in use currently)
class Variables::ScopedVariables < Variables

  def initialize(list)
    @list = list
  end

  Variables.new.members.each do |name|
    define_method name do
      @list.each do |variables|
        value = variables.public_send(name)
        return value unless value.nil?
      end
      nil
    end
  end

end

scoped_variables_spec.rb

# frozen_string_literal: true

RSpec.describe Variables::ScopedVariables do
  let(:one) { Variables.new(canonical_tag: '1') }
  let(:two) { Variables.new(canonical_tag: '2', location: '2') }
  let(:three) { Variables.new(canonical_tag: '3', location: '3', area: '3') }
  let(:variables) { Variables::ScopedVariables.new([one, two, three]) }

  it 'uses hierarchy to find values' do
    expect(variables.canonical_tag).to eq '1'
    expect(variables.location).to eq '2'
    expect(variables.area).to eq '3'
    expect(variables.business).to be_nil
  end
end