Rails - Jun 2005 - AR not saving value ?

Hi all !

There''s something I''m missing here...  Here''s the
code:
class Tracker < ActiveRecord::Base
   belongs_to :user
   has_many :results, :class_name => ''TrackerResult'',
       :exclusively_dependent => true
   validates_presence_of :title

   def crawl()
     logger.info "Before: #{last_trackered_at}"
     last_trackered_at = Time.now
     logger.info "After: #{last_trackered_at}"
     unless save then
       logger.error "Tracker #{id}: #{errors.full_messages}"
       return
     end
     logger.info "After save: #{last_trackered_at}"
   end
end

The problem is that the last_trackered_at column in the DB doesn''t 
change value from NULL...  Here''s an excerpt from my log:

Before:
After: Wed Jun 08 10:27:39 Est (heure d''été) 2005
SQL (0.000000)  BEGIN
Tracker Update (0.000000)  UPDATE trackers SET `created_at` = 
''2005-06-07 10:56:19'', `title` =
''Google.com'', `start_page` =
''http://www.google.com/intl/en/jobs/index.html'', `query_page`
= '''',
`user_id` = 1, `updated_on` = ''2005-06-08 10:27:39'',
`track_now` = 1,
`post_arguments` = '''', `last_trackered_at` = NULL WHERE id = 1
SQL (0.000000)  COMMIT
After save: Wed Jun 08 10:27:39 Est (heure d''été) 2005

You can see in the SQL above that last_trackered_at is explicitely set 
to NULL.

I''ve been trying to get that working for the past hour or so, and I 
can''t seem to find the solution.  I''m sure either I will find
the
solution 10 seconds after I send the E-Mail, or someone will kindly 
remind me to read some manual somewhere :)

Besides, I have another column, named track_now (defined as "integer not 
null" in the DB) which exhibits the same behavior.

Thanks !
François

François Beausoleil wrote:
>   def crawl()
>     logger.info "Before: #{last_trackered_at}"
>     last_trackered_at = Time.now
>     logger.info "After: #{last_trackered_at}"
>     unless save then
>       logger.error "Tracker #{id}: #{errors.full_messages}"
>       return
>     end
>     logger.info "After save: #{last_trackered_at}"
>   end
> end
This is a classic Ruby mistake, which is very easy to make and hard to 
track. Fortunately, it''s easy to fix. You should write:

self.last_trackered_at = Time.now

Without the "self.", Ruby assumes you''re just assigning to a
local
''last_trackered_at'' variable.

rgds,
Dema
-- 
http://dema.ruby.com.br - Rails development from a .NET perspective

Hi !

Demetrius Nunes said the following on 2005-06-08 13:24:
> François Beausoleil wrote:
>>   def crawl()
>>     last_trackered_at = Time.now
>>   end
>> end
> 
> This is a classic Ruby mistake, which is very easy to make and hard to 
> track. Fortunately, it''s easy to fix. You should write:
> 
> self.last_trackered_at = Time.now
> 
> Without the "self.", Ruby assumes you''re just assigning
to a local
> ''last_trackered_at'' variable.
Yeah, right, now why didn''t I try this myself ?  Must have been
laziness...

Thanks !
François