Hi,
I'm not a PHP developper, and I'm quite new to DataMapper, but I'm
pretty sure this is not the right approach. I believe you should use
the hooks (aka callbacks or events) to make this kind of process. The
reference is here http://datamapper.org/doku.php?id=docs:hooks, and
your code should look like this:
class Interest
include DataMapper:Resource
# properties
property :user_id, Integer, :key => true
property :question_id, Integer, :key => true
property :interested_users, Integer, :default => 0
timestamps :at
# associations
belongs_to :user, :child_key => [:user_id]
belongs_to :question, :child_key => [:question_id]
# hooks
before :save, :add_one
protected
def add_one
self.interested_users = self.interested_users + 1
end
end
I believe the hooks are called inside a transaction, so it should be
safe to do this. I used "interested_users" as Integer just to
illustrate, but you can fix it according to your needs.
Unfortunately the documentation is very scarce, I hope to have some
time to help fix that in the near future. Hope this helps.
Cheers,
Rafael
www.rafaelrosafu.com
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