How order doctrine query for many-to-many relationship? - symfony1

Question

i use doctrine 1.2 and here is my schema:
ProviderProduct:
columns:
provider_id:
type: integer
primary: true
product_id:
type: integer
primary: true
num:
type: integer
default: 0
unsigned: true
Provider:
columns:
name: {type: string(255), notnull: true, notblank: true, unique: true}
relations:
Products:
class: Product
local: provider_id
foreign: product_id
refClass: ProviderProduct
Product:
columns:
#a lot of columns
relations:
Providers:
class: Provider
local: product_id
foreign: provider_id
refClass: ProviderProduct
What i want is get product with max num (this is ammount) for specific provider.
I tried this query:
$query = Doctrine_Query::create()->select('p.*')
->from('Product p')
->innerJoin('p.Providers pr')
->where('pr.name = ?', 'WhiteStore')
->orderBy('ProviderProduct.num');
$query->fetchOne();
The result sql query:
SELECT p.* FROM product p
INNER JOIN provider_product p3 ON (p.id = p3.product_id)
INNER JOIN provider p2 ON p2.id = p3.provider_id, provider_product p4
WHERE (p2.name = ?) ORDER BY p4.num
As you can see it doesnt order by num field. So, what is the right dql for my task ?

Answer 1

How order doctrine query for many-to-many relationship?
You can use following construction:
$query = Doctrine_Query::create()->select('p.*')
->from('Product p')
->innerJoin('p.Providers pr')
->where('pr.name = ?', 'WhiteStore')
->orderBy('p.Providers.ProviderProduct.num');
The not native behavior of Doctrine 1 is creating an invisible alias for many-to-many relation. You can use this alias for building right order.

Answer 2

I think you need to relate refClass too:
ProviderProduct:
columns:
provider_id:
type: integer
primary: true
product_id:
type: integer
primary: true
num:
type: integer
default: 0
unsigned: true
relations:
Provider: { foreignAlias: ProviderProduct }
Product: { foreignAlias: ProviderProduct }
And then relate through reffClass to get the number:
$query = Doctrine_Query::create()->select('p.*')
->from('Product p')
->innerJoin('p.ProviderProduct pp')
->innerJoin('pp.Provider pr')
->where('pr.name = ?', 'WhiteStore')
->orderBy('pp.num DESC') // to get de max first
->groupBy('p.id') // if any duplicates
->limit(1);
$product = $query->fetchOne();