Finding a specific row in a PropelCollection - php

Question

I have two tables. One for orders, and for their prefs. The tables look like this:
Order:
+----------+---------------+------------+
| orderID | orderNumber | clientID |
+----------+---------------+------------+
| 1 | abc123 | 2 |
| 2 | orderX | 7 |
| 3 | Joe9 | 2 |
| 4 | Order4 | 2 |
+----------+---------------+------------+
OrderPref
+----------+----------+-------------+
| orderID | prefID | prefValue |
+----------+----------+-------------+
| 1 | 1 | $100 |
| 1 | 2 | 123 |
| 1 | 3 | $35 |
| 2 | 1 | $600 |
| 2 | 2 | 876 |
| 2 | 3 | $44 |
+----------+----------+-------------+
What I want to is for each order, get the prefValue for a specific prefID. Currently, this is what I am doing:
$orders = OrdersQuery::create()->filterByClientID(2)->find();
foreach($orders as $o){
$prefs = $o->getOrderPrefs();
foreach($prefs as $p){
if($p->getPrefID() === 2){
echo $p->getPrefValue();
break;
}
}
}
This works, but there needs to be a better way to get the one row I want for each order without looping through all the prefs.
I know this doesn't work, but is there something like this?
$orders = OrdersQuery::create()->filterByClientID(2)->find();
foreach($orders as $o){
// This obviously doesn't work, so is there a short way to do this?
echo $o->getOrderPrefs()->filterByPrefID(2)->getPrefValue();
}
I was reading the docs and found a ->search() method, but I don't know how to use it.
$orders = OrdersQuery::create()->filterByClientID(2)->find();
foreach($orders as $o){
// How can I search for the row with the prefID I want?
echo $o->getOrderPrefs()->search()->getPrefValue();
}

Answer 1

Looking at some old Propel stuff I've written, I'm guessing something like:
$prefValue = OrdersQuery::create()->
joinOrderPref()->
where('OrderPref.prefID = ?', $prefId)->
filterByClientID($clientId)->
select('OrderPref.prefValue')->
find()
;
The issue is that you need to get a specific column (reference).
For these chainable queries, my view is that an auto-completing editor is pretty much mandatory - remembering the syntax is nigh-on impossible without it.

Answer 2

$prefValues = OrdersQuery::create()
->filterByClientId(2)
->joinOrderPref()
->withColumn('OrderPref.PrefValue', 'theValue')
// row above fetches ONLY the needed column from joined table and
// gives 'theValue' alias to it
->select('theValue')
->find();
With this you don't need to do any foreaches in PHP or do it in two steps.
About the ->select() part - it's there only to not get the fully bloated/hydrated object, but actually only an array (PropelArrayCollection to be precise) with the prefValue data you need.
I didn't test this live though, some syntax issues may arise.