UNION syntax in Cakephp

Question

Anyone knows a good way to make UNION query in CakePHP? I would like to avoid using $this->query();.

With two tables t1, t2:

SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id

With three tables t1, t2, t3:

SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t2.id = t3.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
LEFT JOIN t3 ON t2.id = t3.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
RIGHT JOIN t3 ON t2.id = t3.id

Answer 1

use a code like this :

$friendsPosts= $this->Posts->find('all')
                ->contain(['Users', 'Languages', 'PostStates'])
                ->innerJoinWith('Users.Dusers', function ($q) {
                    return $q->where(['Dusers.id' => $this->Auth->user('id')]);
                });

        $posts= $this->Posts->find('all')
                ->where(['Posts.post_state_id' => 3])
                ->contain(['Users', 'Languages', 'PostStates']);

    $posts->union($friendsPosts);