# File lib/puppet/util/rails/collection_merger.rb, line 2
 2:   def ar_hash_merge(db_hash, mem_hash, args)
 3:     (db_hash.keys | mem_hash.keys).each do |key|
 4:       if (db_hash[key] && mem_hash[key])
 5:         # in both, update value
 6:         args[:modify].call(db_hash[key], mem_hash[key])
 7:       elsif (db_hash[key])
 8:         # in db, not memory, delete from database
 9:         args[:delete].call(db_hash[key])
10:       else
11:         # in mem, not in db, insert into the database
12:         args[:create].call(key, mem_hash[key])
13:       end
14:     end
15:   end