So I'm coming back to DM after some hiatus. I'm looking at an AR
schema where STI relies on the magic "type" column to figure out what
the proposed class for a given row is. Here is some code:
class Collection
include DataMapper::Resource
property :id, Serial
property :name, String
property :type, Class
has n, :collection_items
has n, :items, :through => :collection_items
belongs_to :user
end
class Cart < Collection
include DataMapper::Resource
property :id, Serial
property :total_cache, Integer
property :item_count_cache, BigDecimal
end
Cart.all.each do |cart|
puts "cart #{cart.id} is a #{cart.class} and has a total quantity of
#{cart.total_cache} and belongs to #{cart.user.name}"
end
The loop that iterates Carts gives me all Collections instead of only
those of type Cart. Am I misunderstanding how this is to work. If I
misunderstand it, how would this work with legacy database schema that
rely on a "type" column for disambiguation?
Thanks, and great work since the 0.3ish verisons.
Steve
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