This will get messy very fast. Imagine only 20 categories and for this simple
count, you'll already have 20 queries. Not good. :(
Normally, you'd do a count on the category_id column and group by the same
category_id column. So simple in SQL/Doctrine but so hard in Propel. :(
Daniel
On 2009-12-01, at 1/December, 2:58 PM, Gareth McCumskey wrote:
> First, you will always have a category with at least one product because you
> have set cascade on delete.
>
> For the second part, in your CategoryPeer class:
>
> public static function getProductCountPerCategory()
> {
> //Get all categories
> $category_obj_arr = self::doSelect(new Criteria());
>
> //Get count of products per category
> $product_per_category_count = array();
>
> foreach ($category_obj_arr as $category_obj)
> {
> $product_c = new Criteria();
> $product_c->add(ProductPeer::CATEGORY_ID, $category_obj->getId());
> $product_per_category_count[$category_obj->getTitle()] =
> ProductPeer::doCount($product_c);
> }
>
> return $product_per_category_count;
> }
>
> Thats one example. You don't always have to do everything in a query using
> joins and to be honest we have often seen massive performance improvements
> NOT using switching away from joins.
>
> On Tue, Dec 1, 2009 at 2:56 PM, g0d br <[email protected]> wrote:
> Hi,
>
> I dont even know how to ask that but i want to show what i need.
>
> my schema.yml
> category:
> id: ~
> title: { type: varchar(100), required: true, index: unique }
>
> product:
> id:~
> category_id: { type: integer, foreignTable: category, foreignReference: id,
> onDelete: cascade }
> name: { type: varchar(100), required: true, index: unique }
>
> i want to retrieve all categories that have a least one product and i want to
> show how many products each category.
>
> thank you.
>
> Celso
>
> ps. sorry about my english i dont know if the question is understandable.
>
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>
> --
> Gareth McCumskey
> http://garethmccumskey.blogspot.com
> twitter: @garethmcc
>
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