+
+ # helper method to get links for given object or uuid
+ helper_method :links_for_object
+ def links_for_object object_or_uuid
+ uuid = object_or_uuid.is_a?(String) ? object_or_uuid : object_or_uuid.uuid
+ preload_links_for_objects([uuid])
+ @all_links_for[uuid]
+ end
+
+ # helper method to preload links for given objects and uuids
+ helper_method :preload_links_for_objects
+ def preload_links_for_objects objects_and_uuids
+ uuids = objects_and_uuids.collect { |x| x.is_a?(String) ? x : x.uuid }
+ @all_links_for ||= {}
+ if not uuids.select { |x| @all_links_for[x].nil? }.any?
+ # already preloaded for all of these uuids
+ return
+ end
+ uuids.each do |x|
+ @all_links_for[x] = []
+ end
+ # TODO: make sure we get every page of results from API server
+ Link.filter([['head_uuid','in',uuids]]).each do |link|
+ @all_links_for[link.head_uuid] << link
+ end
+ end
+
+ # helper method to get a certain number of objects of a specific type
+ # this can be used to replace any uses of: "dataclass.limit(n)"
+ helper_method :get_objects_of_type
+ def get_objects_of_type dataclass, size
+ # if the objects_map has a value for this dataclass, and the size used
+ # to retrieve those objects is greater than equal to size, return it
+ size_key = "#{dataclass}_size"
+ if @objects_map && @objects_map[dataclass] && @objects_map[size_key] &&
+ (@objects_map[size_key] >= size)
+ return @objects_map[dataclass]
+ end
+
+ @objects_map = {}
+ @objects_map[dataclass] = dataclass.limit(size)
+ @objects_map[size_key] = size
+
+ return @objects_map[dataclass]
+ end
+