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module Puppet::Util::CollectionMerger
# Merge new values with the old list. This is only necessary
# because deletion seems to mess things up on unsaved objects.
def collection_merge(collection, args)
remove = []
list = args[:existing] || send(collection)
hash = args[:updates]
list.each do |object|
name = object.name
if existing = hash[name]
hash.delete(name)
if existing.respond_to?(:to_rails)
existing.to_rails(self, object)
elsif args.include?(:modify)
args[:modify].call(object, name, existing)
else
raise ArgumentError, "Must pass :modify or the new objects must respond to :to_rails"
end
else
remove << object
end
end
# Make a new rails object for the rest of them
hash.each do |name, object|
if object.respond_to?(:to_rails)
object.to_rails(self)
elsif args.include?(:create)
args[:create].call(name, object)
else
raise ArgumentError, "Must pass :create or the new objects must respond to :to_rails"
end
end
# Now remove anything necessary.
remove.each do |object|
send(collection).delete(object)
end
end
def ar_hash_merge(db_hash, mem_hash, args)
(db_hash.keys | mem_hash.keys).each do |key|
if (db_hash[key] && mem_hash[key])
# in both, update value
args[:modify].call(db_hash[key], mem_hash[key])
elsif (db_hash[key])
# in db, not memory, delete from database
args[:delete].call(db_hash[key])
else
# in mem, not in db, insert into the database
args[:create].call(key, mem_hash[key])
end
end
end
end
# $Id$
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