class Eco::Data::Locations::NodeDiff
  module Selectors
    # Creates selector methods on `diffs` (nodes that changed)
    # It also creates a method with question mark that evaluates true if **any** diff matches.
    # @note the selector method name with a question mark should exist in the `diff_result_class`
    def selector(*attrs)
      attrs.each do |attr|
        meth  = attr.to_sym
        methq = "#{meth}?".to_sym
        define_method meth do
          diffs.select(&methq)
        end

        define_method methq do
          diffs.any?(&methq)
        end
      end
    end
  end
end