Question

Cakephp complex query question

Asked by: bakerleo9

I am stuck on a simple query problem :
These are the tables involved :

Group
    id
    name

User
    id
    name

Groups_Users   (for HABTM)
   id
   group_id
   user_id

Now i have an admin system that lets the admin view the group and all the related users.
Which is working fine. However, I want to do the OPPOSITE.
View the group and display ALL the users that are not in that group. How would I structure my $find statement?  

Obviously, this is wrong but it is what i need it to do :
            $users = $this->User->find('all',array('conditions'=>

                        array('NOT'=>array('User.id' => 'GroupsUser.user_id')))

                        );

This next set of code, is what i want it to do, but not have to explicitly declare the user ids
This would return all users NOT 1,2,3,4.
 
                    $filter = array(1,2,3,4);  
                     $users = $this->User->find('all',array('conditions'=>
                             array('NOT'=>array('User.id' =>  $filter)))
                        );

would appreciate all help.

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Asked On
2009-03-27 at 23:06:50ID24273320
Tags

cakephp

,

php

,

habtm

,

cake

,

query

,

sql

Topics

PHP Frameworks

,

PHP Scripting Language

,

PHP and Databases

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: BrianGEFF719Posted on 2009-03-28 at 16:25:28ID: 24010760

in /config/core.php, set debug level 2 or 3, and post the query that is actually being executed.

 

by: MasonWolfPosted on 2009-03-28 at 16:39:33ID: 24010799

If a user could belong to only one group, it wouldn't be so hard. But your situation is trickier. The SQL query you want, basically, is:

'SELECT * FROM users WHERE users.id NOT IN (SELECT DISTINCT users_groups.user_id FROM users_groups WHERE users_groups.group_id = $groupID)

I do not think you can do that directly with find(), but if you don't mind an intermediate step, you can at least get your result.


$users = $this->Group->User->find('list', 
    array('conditions' => array('User.group_id' => $groupID);
 
$filter = array();
foreach($users as $id => $info) {
    $filter[] = $id;
}
 
$users = $this->User->find('all',
    array('conditions'=> array('NOT'=>
        array('User.id' =>  $filter))
    ));

                                              
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