Re: Find most uses categories with a count?

On Mon, Nov 1, 2010 at 4:13 PM, DigitalDude
<e.blumstengel@googlemail.com> wrote:
> Hey,
>
> I was wondering the other day how can I achieve the following result
> by doing a find on a specific model:
>
> Let's say I have a table called items and they've got a foreign key to
> a category (category_id).
>
> What I want to have is a find, that picks me the 10 most used
> categories from the table items, sorted from most to less. The result
> should be:
>
> Category 5 - 11 items
> Category 2 - 7  items
> Category 9 - 3 items
> Category 1 - 2 items
> ...
>
> I think you'll get the idea. A simple key -> value array with the key
> as the category_id and the value as the count of the items would be
> all I need but it could also be an array with the name of the category
> also if someone is able to do that...

Looks like a job for counterCache:
http://book.cakephp.org/view/816/counterCache-Cache-your-count

Then your query would be a simple:
$data = $this->Category->find(
'all',
array(
'fields' => array(
'Category.id', 'Category.item_count'
),
'order' => array('Category.item_count' => 'DESC'),
'limit' => 10
)
);

You could then use Set::extract() to format the result into a simple
key => value, 1-D array.

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