Something like this? (This actually sets the others off AFTER setting
this one on, but it makes little difference). If you put the login in
beforeSave(), and the save fails, then the album won't have a default
photo.
(code not tested, might be typos)
class Photo extends AppModel {
var $name = "Photo";
var $belongsTo = array('PhotoAlbum');
function afterSave($created) {
if (!empty($this->data[$this->alias]['photo_album_id'])) {
if (!empty($this->data[$this->alias]['default'])) {
// We have set this photo to default, so unset the default
flag in all other photos in this album
$this->updateAll(array('default' => '0'),
array('photo_album_id' => $this->data[$this->alias]
['photo_album_id']), 'id' => '<> ' . $this->id);
}
}
}
}
On Jan 18, 3:27 pm, Jaime <[EMAIL PROTECTED]> wrote:
> Hello bakers!
>
> Imagine this (common) scenario: a photo album that HasMany photos. A
> user may select one of them as a "cover" or "default" photo to
> illustrate the cover of the album. So a boolean field called "default"
> is set in the Photo model. Of course one and only one photo within
> that album should have the "default" bit set, because it's non-sense
> to flag more than one for the same album.
>
> This leads to some extra logic within the controller in order to unset
> all other possibly previously flagged photos before setting the new
> one. This is not a big deal nor very important, but is not very
> beautiful either, is it?
>
> As the great piece of software CakePHP is, perhaps there is the
> possibility to specify within the model that only one register within
> a given set can have a boolean field set. Or maybe can be defined
> somehow in the MySQL DB.
>
> I hope this is not a too philosophical question :-)
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