[development] Demystifying $view->exposed_data

[Earl Miles]

You're in a batch, and Views has a bug with batches. It's fixed in the
-dev version: See http://drupal.org/node/829550

On 6/4/2011 7:59 AM, Dipen wrote:
> Hi,
> 
> I am badly stuck at this one, I am trying to convert a cron function
> to batched drush execution to overcome memory limits etc. I could
> have gone for queued cron execution but in my initial assessment I
> found batched drush execution simpler. Anyways, I am using
> views_savedsearches to allow my users to keep a tab on their exposed
> filters, since the data keeps coming in for their criteria I am also
> using notifications_views_savedsearches (which comes in the same
> package) to notify them if they have subscribed to their saved
> searches. So All is good except the amount of content is huge for
> hook_cron of notifications_views_savedsearches to process without
> memory errors which prompted me to convert it into batched drush
> execution.
> 
> So I got to a good start and quickly deconstructed (almost) the
> notifications_views_savedsearches_cron implementation into batch 
> process to be run by drush. Everything is fine, except that 
> $view->execute() doesn't return any result for my implementation but 
> does yield results in the original implementation. This is the place
> I am stuck, few things to note here:
> 
> 1> $view Object just before calling $view->execute() is exactly same
> for both implementations ( old cron and new batch worker process ), I
> ran a diff couple of times. Please note that both functions have
> practically same code except that I had to write couple of extra
> function to make batch work. 2> On further investigation found out
> that query and count query are same too but args are different.
> 
> Am I wrong to assume that calling execute() on two identical view 
> objects can lead to different results? Atleast thats what I am 
> experiencing? (There is no additional processing on the view object, 
> they are exactly same before execute() is called on them)
> 
> On further investigation found out that the view object of my batch 
> worker process has $this->exposed_data empty and thats the reason
> for args to be malformed and for query to returning empty result. I
> haven't been able to find out much on why is exposed_data set in one
> view and not in other when they were identical before calling
> execute() on them, looking at call stack, I found out much of the
> query building and pre processing is done in $this->build and
> $this->_build($key) and thats where $this->exposed_data is bailing
> out on me.
> 
> Some of the debugged Arrays:
> 
> $args for the cron function (the one thats working) - Array ( [0] =>
> drealty_property [1] => 0 [2] => 100000000 [3] => 0 [4] => 0 [5] =>
> 39 )
> 
> $this->exposed_data returns a healthy array
> 
> One thats not working ( my batched execution $args) :
> 
> Array ( [0] => drealty_property [1] => [2] => [3] => [4] => [5] => 
> [6] => )
> 
> $this->exposed_data doesn't return anything.
> 
> 
> Code of both functions is almost same and the $view object just prior
> to $view->execute() is exactly identical.
> 
> Has anyone faced anything similar? Could it be due to the batch API?
> I am using drush_backend_batch_process() to process my batch.
> Everything else is working except that my batch process doesn't have
> anything in $view->result. I haven't been able to find where does 
> $this->exposed_data get set.
> 
> Crux of code for both function is:
> 
> $vs = views_savedsearches_load($subscription['sid']);  // Retrieving 
> exposed filter setting for the subscriber using helper function of 
> views_savedsearches
> 
> $view_name = db_result(db_query("SELECT name FROM {views_view} WHERE 
> vid = %d", $vs->vid));
> 
> $view = views_get_view($view_name);
> 
> if (is_object($view) && is_object($vs)) { if ($view instanceof view)
> {
> 
> // Apply $vs->filters $view->set_exposed_input($vs->filters);
> 
> // The original code limits this value to 10 which is not much useful
> as new data at any point of time is anytime more than 10 
> $view->pager['items_per_page'] = 0;
> 
> // Run the query   // $view at this point in both functions is 
> exactly same ( did a diff ) $view->execute('default');
> 
> $view->result  is empty for my batch process but has values for the
> old cron function. I am pretty sure(?), that I am not making a silly 
> variable in scope mistake.
> 
> 
> Thanks in Advance
> 
> 
> 
> ---------------------------------- Dipen Chaudhary QED42 : We build
> beautiful and scalable web strategies ( www.qed42.com 
> <http://www.qed42.com> ) Blog: dipenchaudhary.com
> <http://dipenchaudhary.com> Twitter: http://twitter.com/dipench
>