Active_record_context, optimistic locking and object reload

It seems that active_record_context (by Rick O.) and optimistic
locking don’t play too well together.
When I enable active_record_context for the entire design, objects
don’t properly reload.

This is more or less what I’m doing:

while !ok {
begin
Transaction {
object1.save!
object2.save!
ok = true
}

rescue
object1.reload
object2.reload
… reapply my changes to the objects …
end
}

So, when I’m using active_record_context, which does wonders to the
database accesses, it seems that the reload doesn’t function
correctly. I don’t see any database fetches and thus, optimistic
locking keeps failing (since the other mongrel instances have changed
the data).

active_record_context:

Any ideas?

Thanks,
Helzer

active_record_context overrides find to return cached values, reload
basically replaces the object’s attributes with the result of
self.class.find(self.id) so this isn’t unexpected. It would be hard for
active_record_context to also override reload so that it removes the
current object from the cache.

Fred

Thanks Fred,

Is there a way for me to force reload from the database?
I just need it in a very limited number of places, so doing it
manually will not be a problem.

Helzer

helzer wrote:

Thanks Fred,

Is there a way for me to force reload from the database?
I just need it in a very limited number of places, so doing it
manually will not be a problem.

Not without overriding reload: reload just calls find, which ar_context
changes: you need to add code to reload that dumps the cache (and the
nice thing to do after that would be to give the changes back to rick)

Fred

On 9/26/07, Frederick C. [email protected] wrote:

nice thing to do after that would be to give the changes back to rick)
Oh, I think I may have run into this without realizing it. I just
shuffled my callbacks around a bit and it worked, but I didn’t realize
this plugin was causing the issue. Um, gmail isn’t showing the rest
of this conversation, so just send me a proper bug report at
http://ar-code.lighthouseapp.com/projects/3108-plugins/overview or via
email. A patch would be lovely too of course.


Rick O.
http://lighthouseapp.com
http://weblog.techno-weenie.net
http://mephistoblog.com

Hi Rick,

Funny thing, gmail stopped notifying me about thread additions too…
I just created the ticket in lighthouse about this.
http://ar-code.lighthouseapp.com/projects/3108-plugins/tickets/5-active_record_context-prevents-object-reload-from-database

Thanks,
Amir

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