I'm having some problems with creating pagination with a HABTM relationship. First, the tables and relationships:
requests (id, to_location_id, from_location_id)
locations (id, name)
items_locations (id, item_id, location_id)
items (id, name)
So, a Request has a Location the request is coming from and a Location the Request is going to . For this question, I'm only concerned about the "to" location.
Request --belongsTo--> Location* --hasAndBelongsToMany--> Item
(* as "ToLocation")
In my RequestController, I want to paginate all the Items in a Request's ToLocation.
// RequestsController
var $paginate = array(
'Item' => array(
'limit' => 5,
'contain' => array(
"Location"
)
)
);
// RequestController::add()
$locationId = 21;
$items = $this->paginate('Item', array(
"Location.id" => $locationId
));
And this is failing, because it is generating this SQL:
SELECT COUNT(*) AS count FROM items Item WHERE Location.id = 21
I can't figure out how to make it actually use the "contain" argument of $paginate
...
Any ideas?
after 3 days searching, I found the way
var $paginate = array('Post'=>array('group'=>'Post.id'));
It's recomended to add group, because sometimes we will get duplicte posts in different categories
$this->Post->bindModel(array('hasOne'=>array('CategoriesPost')), false);
$out = $this->paginate('Post', array('CategoriesPost.category_id'=>array(1,4,7,6)));
Add false to use bind model to all queries, not only to the following
To paginate HABTM, you need to temporarily bind 'hasOne' join model to model which you paginate:
// prepare to paginate Item
$this->Item->bindModel(array('hasOne'=>array('ItemsLocation')));
$contain['ItemsLocation']=array();
$conditions[]=array('ItemsLocation.location_id'=>$locationId);
$order = array('Item.created' => 'desc'); // set order
...
$items = $this->paginate('Item', compact('conditions','contain','order'));
I've been able to get it working somewhat, but the solution doesn't feel very cakey at all.
$items = $this->paginate(
$this->Request->ToLocation->Item,
array(
"Item.id IN ("
. "SELECT item_id FROM items_locations "
. "WHERE location_id = " . $locationId
. ")"
)
);
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