Question

table1(users)
|ID|name  |type  |
|1 |demo  |admin |
|2 |demoX |client|

table2(visits)
|ID|admin_id|visitor_id|visit_date|...
|1 |1       |2         |2013-01-01|...
admin(fk)->users(id)
user(fk)->users(id)

simple scheduler project, it contain 2 tables.

1st (users) contain all users, 2nd table contain all bookings(visits).

to get all bookings of an admin i run Select * from visits where admin_id=$id;, and join
visitor info from users table.

……..
so basically,

every admin can have many visit

visit must contain (ONE)admin and (ONE)visitor.

how can i setup this kind of relation in datamapper orm ?

Answer 1

This should do it:

class Users extends Datamapper
{
    public $has_many = array(
        'admin' => array(
            'class' => 'users',
            'other_field' => 'admin', // FK = admin_id
        ),
        'visitor' => array(
            'class' => 'users',
            'other_field' => 'visitor', // FK = visitor_id
        ),
    );
}

class Visits extends Datamapper
{
    public $has_one = array(
        'admin' => array(
            'class' => 'users',
            'join_self_as' => 'admin', // FK = admin_id
        ),
        'visitor' => array(
            'class' => 'users',
            'join_self_as' => 'visitor', // FK = visitor_id
        ),
    );
}

// then in your controller you can do:

$visit = new Visitor(1);
echo $visit->admin->name; // echo's 'demo';
echo $visit->visitor->name; // echo's 'demoX';