Let's say I have a Zookeeper (as in someone running a zoo and not the Hadoop coordination software) entity that has an association of Animal entities, which include Elephant, Monkey, and Giraffe subclasses. So I have the following:
class Zookeeper include DataMapper::Resource . . . has n, :animals end class Animal include DataMapper::Resource property :id, Serial property :type, Discriminator property :number_of_legs, Integer property :created_at, DateTime property :updated_at, DateTime . . . belongs_to :zookeeper end class Elephant < Animal; end class Monkey < Animal; end class Giraffe < Animal; end I would like to add a method to my Zookeeper class that can get the last Elephant added to the collection as defined by the created_at property. I feel like outside the class I could do something like Elephant.last(:zookeeper_id => id) But I would like the method to be part of the Zookeeper class. I have studied the documentation, but I can't find a use case where the parent of an association wants to locate one particular child in the association. Any insight is appreciated. Thanks. -- You received this message because you are subscribed to the Google Groups "DataMapper" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/datamapper?hl=en.
