问题
Basically I have following models in CakePHP:
User(id, username)
Photo(id, user_id, path)
I have set up following relation: User hasMany Photo.
On one screen, I would like to list users, and show random photo next to each user. I tried setting up following relation:
User hasOne SamplePhoto (where SamplePhoto is just Photo model)
but when user has two photos for instance, he is listed twice on the list.
basically my question is: can you reduce hasMany relation to hasOne, without adding any fields to table schema presented above? I would like to tell cake - find the first record in the Photo table which matches a certain user_id.
回答1:
You could also use the Containable behaviour and then set up something like:
$this->User->find(
'all',
array(
'contains' => array(
'Photo' => array(
'order' => 'rand()',
'limit' => 1
)
)
)
);
You should then get something like
Array
(
[User] => Array
(
[id] => 121
[username] => tom
)
[Photo] => Array
(
[0] => Array
(
[id] => 123
[user_id] => 121
[path] => Somewhere
)
)
)
回答2:
if you do a find like $this->User->read(null,$id), the return will be an array that looks something like:
Array
(
[User] => Array
(
[id] => 121
[username] => tom
)
[Photo] => Array
(
[0] => Array
(
[id] => 123
[user_id] => 121
[path] => Somewhere
)
[1] => Array
(
[id] => 124
[user_id] => 121
[path] => SomeOtherPlace
)
)
)
From this array you can pick the photo however you like, be it the first:
$this->data['Photo'][0]
the last:
$this->data['Photo'][count($this->data['Photo'])]
an explicit record:
$this->data['Photo'][3]
or by some random means:
$this->data['Photo'][$rnd]
回答3:
Don't make this more complicated than it needs to be. :)
$data = $this->User->Photo->find('first',
array('conditions' => array('Photo.user_id' => $id)));
Gives you a photo in $data['Photo']
with the user attached in $data['User']
.
回答4:
You'd do something like:
$user = $this->User->find('first', array('conditions' =>
array('username'=>$this->data['User']['username'],
'active'=>true) ));
来源:https://stackoverflow.com/questions/4047737/hasmany-reduced-to-hasone-in-cakephp