Perhaps instead of using "before :save", u can try the following alternative:
"
class Interest
...
after :question=, :increment_interested_users
def increment_interested_users
question.interested_users += 1
end
end
"
DM provides before & after hooks for any method, not just :save. I
find it really a very convenient feature.
Cheers !!
==
On Tue, Mar 10, 2009 at 2:06 AM, Rafael George <[email protected]> wrote:
>
> 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
>
> >
>
--
http://ngty77.blogspot.com
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