I'm using an existing database (I can't change it and its table names are not like cake conventions want it), and I'd like to do some left joins but can't do it properly :/
I've already defined my tables, giving them primary keys and the relations in the models.
Here is my problem :
Table Wysipage can have 0 to n wysipage_content, and 0 to n wysipage_menu.
an element from wysipage_content corresponds to 1 and only 1 Wysipage.
an element from wysipage_menu corresponds to 0 or 1 Wysipage.
I'd like to make a request who would give me a list of all the elements from Wysipages, with their eventuals contents and menus, all that in a single table, and by only one request.
Here are my tables definitions (I'm avoiding you the entire schema, just be aware there is a wp_id and a wp_name column) :
class Wysipage extends AppModel {
var $actsAs = array('Containable');
public $useTable = 'wysipage';
public $primaryKey = 'wp_id';
public $displayField = 'wp_name';
var $hasMany = array(
'un' => array(
'Wysipage_contenu' => array(
'className' => 'Wysipage_contenu',
'foreignKey' => 'wpc_wp_id',
)),
'deux' => array(
'Wysipage_menu' => array(
'className' => 'Wysipage_menu',
'foreignKey' => 'wpm_wp_id',
))
);
class Wysipage_contenu extends AppModel {
var $actsAs = array('Containable');
public $useTable = 'wysipage_contenu';
public $primaryKey = 'wpc_id';
public $displayField = 'wpc_h1';
public $belongsTo = array(
'Wysipage' => array(
'className' => 'Wysipage',
'foreignKey' => 'wp_id'
)
);
class Wysipage_menu extends AppModel {
var $actsAs = array('Containable');
public $useTable = 'wysipage_menu';
public $primaryKey = 'wm_id';
public $displayField = 'wm_lien';
public $belongsTo = array(
'Wysipage' => array(
'className' => 'Wysipage',
'foreignKey' => 'wm_wp_id'
)
);
And here is my code to try request (but failed) :
$this->loadModel('Wysipage_contenu');
$this->loadModel('Wysipage_menu');
$this->Wysipage->contain();
$mes_wysipages = $this->Wysipage->find('all', array('joins' => array(
array(
'table' => 'wysipage_contenu',
'alias' => 'wpc',
'type' => 'LEFT',
'conditions'=> array('wpc.wpc_wp_id = Wysipage.wp_id')
),
array(
'table' => 'wysipage_menu',
'alias' => 'wpm',
'type' => 'LEFT',
'conditions'=> array('wpm.wm_wp_id = Wysipage.wp_id')
)
)));
$this->set('wysipages', $mes_wysipages);
$this->render();
What have I done wrong? Is the problem in my model declarations? Or do I use a wrong request type? :(
The request I'd like to make is simply :
SELECT wp_id, wp_name, wpc_id, wpc_name
FROM wysipage
LEFT JOIN wysipage_contenu ON wysipage.wp_id = wysipage_contenu.wpc_wp_id
Just this :(
I'm not even sure I want a LEFT join or a RIGHT join, but anyway the problem remains the same, this code gives me bad answers with multiple occurrences of the same lines :/
Thanks :/
PS : Sorry for my bad English, it's not my native language.
You can not join content and menu tables on wp_id in same query because they both have many-to-one relationship to wp_id, and there by for each row from content there are all rows from menu with same wp_id in result of such join. You need to do 2 queries: one for content and one for menu. Or if list columns you needed identical for both tables you can union both results from this two queries.
Related
I have 3 tree like connected tables. Their schemas as follows:
Member{
//Some column
}
Transactions{
member_id :: foreign key of member table
//Some other column
}
TransactionItems{
transaction_id :: foreign key of Transaction table
//Some other column
}
I define models like this:
class Members extends AppModel {
public $primaryKey = 'id';
public $hasOne = array(
'Transactions' => array(
'className' => 'Transactions',
'foreignKey' => 'member_id',
'dependent' => true
)
);
}
class Transactions extends AppModel {
public $primaryKey = 'id';
public $belongTo = array('Members');
public $hasOne = array(
'TransactionItems' => array(
'className' => 'TransactionItems',
'foreignKey' => 'transaction_id',
'dependent' => true
)
);
}
class TransactionItems extends AppModel {
public $primaryKey = 'id';
public $belongTo = array('Transactions');
public $belongsTo = array(
'Transactions' => array(
'className' => 'Transactions',
'foreignKey' => 'transaction_id'
)
);
}
I have a Data Array which I want to save into database. My scheme is:
Array(
[Members] = [],//Array
[Transactions] = [],//Array
[TransactionItems] = []//Array
)
The problem is that whenever I run $this->Members->saveAll($data). It save data in Member and Transactions table. But do not create data in TransactionItems table. I want to save in all 3 tables at a time.
Any help would be grateful.
Second level (and above) associations must be nested, ie the data structure needs to be:
array(
'Members' => array(),
'Transactions' => array(
'TransactionItems' => array()
)
)
A bit awkward, but that's how it works in 2.x. You can always refer to the structure that is being returned when reading data, it needs to be the same when saving it.
Furthermore you must set the deep option to true in order to be able to save second level and above associations (by default only first level associations are being saved):
$this->Members->saveAll($data, array('deep' => true));
See also
Cookbook > Models > Saving Your Data > Model::saveAssociated()
User Model has relation:
public $hasMany = array(
'MyRecipe' => array(
'className' => 'Recipe',
)
);
I want to select all users who have recipes with ID: 1,2
How I can use that conditions in select:
$this->User->find('all', array(
'conditions' => array(
'Recipe.Id' => [1,2]
)
));
But in this example I will get also Users without recipes, how to prevent that ?
please give this relation in User model
class User extends AppModel
{
var $name = 'User';
var $belongsTo = array("Recipe");
}
and in user controller your query as
$list = $this->User->find('all',array("conditions"=>array("recipe_id IN"=> [1,2] )));
its gives output which you want..
I have a problem with querying associated data from a Model in CakePHP. I wrote an example to show the behavior:
TestController.php:
class TestController extends AppController
{
public $uses = array(
'User',
'Upload',
'Detail'
);
public function test(){
$result = $this->Upload->find('all', array(
'recursive' => 2,
'conditions' => array('Detail.id' => 1)
));
print_r($result);
}
}
Upload.php:
class Upload extends AppModel {
public $belongsTo = array(
'User' => array(
'className' => 'User',
'foreignKey' => 'user_id'
)
);
}
Detail.php:
class Detail extends AppModel {
public $belongsTo = array(
'User' => array(
'className' => 'User',
'foreignKey' => 'user_id'
)
);
}
User.php:
class User extends AppModel {
public $hasOne = 'Detail';
public $hasMany = array(
'Upload' => array(
'className' => 'Upload',
'foreignKey' => 'user_id',
)
);
}
When I remove the condition I get back an array with Details included. But with the condition I get the following error:
Error: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'Detail.id' in 'where clause'
Looking at the SQL Queries it seems like he is not joining the tables correctly when I add the condition. Without the condition he is joining all three tables.
Is this a bug in CakePHP or am I doing anything wrong?
No, it is not a bug with CakePHP. It's simply the way it's designed, using conditions during a find on associated models will often create an invalid query. You should be using containable behavior or manually joining to use conditions on associated models.
Also, I suspect that you will not get the results you are looking for doing this way anyways. CakePHP by default uses left joins. Therefore, your results will not be limited by those associated with the desired Detail ID, but rather, it will get all uploads, all users associated with those uploads, and then only those details associated with those users that have the correct ID. The simplest way then to get what you're probably looking for is to do the query from the opposite direction:
$result = $this->Detail->find('all', array(
'recursive' => 2,
'conditions' => array('Detail.id' => 1)
));
EDIT: If you do want to do left joins, then make your query this way:
$result = $this->Upload->find('all', array(
'contain' => array('User' => array('Detail' => array('conditions' => array('Detail.id' => 1))),
));
My Category Model:
class Category extends AppModel {
public $displayField = 'name';
// public $actsAs = array('Containable');
public $hasAndBelongsToMany = array(
'Post' => array(
'className' => 'Post',
'joinTable' => 'categories_postss',
'foreignKey' => 'category_id',
'associationForeignKey' => 'post_id',
'unique' => 'keepExisting'
)
);
}
$params['contain'] = array('Post' => array(
'limit'=> 3));
pr($this->Category->find('first',$params)); exit;
It is fetching all Posts, irrespective of limit.
What I want to do:
I have this page where I ma listing all the categories and latest 5 posts related to it.
I want to limit the associated model to only 5 rows.
Any ideas?
Containable behavior is not in use
The most likely reason for this problem is that the containable behavior is not being used at all.
Compare, for the below code example:
$results = $this->Category->find('first', array(
'contain' => array(
'Post' => array(
'limit' => 3
)
)
));
Without containable behavior, it'll generate the following queries:
SELECT ... FROM `crud`.`categories` AS `Category` WHERE 1 = 1 LIMIT
SELECT ... FROM `crud`.`posts` AS `Post`
JOIN `crud`.`categories_posts` AS `CategoriesPost` ON (...)
With containable behavior, it'll generate the following queries:
SELECT ... FROM `crud`.`categories` AS `Category` WHERE 1 = 1 LIMIT
SELECT ... FROM `crud`.`posts` AS `Post`
JOIN `crud`.`categories_posts` AS `CategoriesPost` ON (...) LIMIT 3
Given this (and the code in the question) check that the AppModel has the containable behavior in $actsAs:
<?php
// app/Model/AppModel.php
class AppModel extends Model {
public $actsAs = array('Containable');
}
Limit always required?
Alternatively, or possibly in addition, you may prefer to put a limit in the association definition - To do so just define the 'limit' key:
class Category extends AppModel {
public $hasAndBelongsToMany = array(
'Post' => array(
'limit' => 100, // default to a high but usable number of results
)
);
}
the hasAndBelongsToMany relationship seems unnecessary to me. I think you only need Category hasMany Post and Post belongsTo Category relationships. Add category_id to the posts table. Make both models actAs containable.
Post Model
class Post extends AppModel {
public $actsAs = array('Containable');
var $belongsTo = array(
'Category' => array(
'className' => 'Category',
'foreignKey' => 'category_id'
),
// ... more relationships
);
Category Model
class Category extends AppModel {
public $actsAs = array('Containable');
var $hasMany = array(
'Post' => array(
'className' => 'Post',
'foreignKey' => 'category_id'
),
// ... more relationships
);
Categories Controller
class CategoriesController extends AppController {
public $paginate = array(
'Category' => array(
'contain' => array(
'Post' => array(
'limit' => 3
), // end Post
) // end Category contain
) // end Category pagination
); // end pagination
public function index() {
// for paginated results
$this->set('categories', $this->paginate());
// for find results
$this->Category->contain(array(
'Post' => array(
'limit' => 3
)
));
$this->set('categories', $this->Category->find('all'));
}
Model box
public $hasMany = array('Ticket' => array(
'className' => 'Ticket',
'order' => 'Ticket.created DESC',
'foreign_key' => 'box_id'
));
Model Ticket
public $belongsTo = 'Box';
In BoxesController I get data from box table
$this->set('boxes', $this->Box->find('all'));
This function get all data from table Box and from table Ticket.
How can I get data only from one table, without join other tables?
$this->Box->recursive = -1;
$this->set('boxes', $this->Box->find('all'));
or
$this->Box->unbindModel(
array('hasMany' => array('Ticket'))
);
$this->set('boxes', $this->Box->find('all'));
More on recursive