Re: Pagination using associated model record count?

On Sun, Dec 5, 2010 at 6:59 AM, Toby G <toby@tgpromotions.com> wrote:
> Hi there,
> Not sure where to start with this one, so offering it up for advice.
> I have 2 associated models...
> * Members
> * Events
> * Roles
>
> The Roles table links the members to events.
>
> What I would like to do is include the number of events a member has
> been involved with by including the Event count in the Members list
> (index) view, but would also like to be able to use the Paginator's
> magic to be able to sort by the number of events a member has been
> involved with.
>
> The models are setup as...
> Member hasMany Roles
> Event hasMany Roles
>
> Can anyone offer any advice on how to do this?

Have a look at counterCache.

http://book.cakephp.org/view/1031/Saving-Your-Data#counterCache-Cache-your-count-1033

You could store the number of Events per Member directly in the
members table. If I was doing this I'd use Containable and do
something like:

public $paginate = array(
'fields' => array('Member.*'),
'limit' => [some number],
'order' => array(
'Member.events_count' => 'DESC'
),
'contain' => array(
'Role' => array(
'Event'
)
)
);

>
> To make it a little more complicated some Members may perform multiple
> roles at 1 event, but I am interested in the number of unique Events
> for a Member, not the number of Roles they have performed.

In that case, you might be better off using HABTM associations.

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