Thanks it's look like that the way to go, but i tried it and did not
work. Here is the code for the two model involve and the code for the
hook.
class Question
include DataMapper::Resource
# properties
property :id, Serial
property :title, String, :nullable => false, :length => (1..255)
property :body, Text
property :interested_users, Integer, :default => 0
timestamps :at
# associations
belongs_to :user
has n, :answers
has n, :interests
has n, :users, :through => :interests
end
class Interest
include DataMapper::Resource
# properties
property :user_id, Integer, :key => true
property :question_id, Integer, :key => true
timestamps :at
# associations
belongs_to :user, :child_key => [:user_id]
belongs_to :question, :child_key => [:question_id]
# hooks
before :save, :save_interested
def save_interested
question = self.question
question.interested_users = question.interested_users+1
self.question.save
end
end
On Mon, Mar 9, 2009 at 12:03 PM, Rafael <[email protected]> wrote:
>
> 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
> >
>
--
Rafael George
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