require "diff/lcs" module Zonesync class Diff < Struct.new(:from, :to) def self.call(from:, to:) new(from, to).call end def call changes = ::Diff::LCS.sdiff(from.diffable_records, to.diffable_records) changes.map do |change| case change.action when "-" [:remove, [change.old_element.to_h]] when "!" [:change, [change.old_element.to_h, change.new_element.to_h]] when "+" [:add, [change.new_element.to_h]] end end.compact end end end